Lighting system and sensor platform for controlled agricultural environments

ABSTRACT

A lighting system includes two or more lighting fixtures, each comprising a housing, at least one light source mechanically supported by the housing, at least one pipe thermally coupled to the housing to carry a fluid coolant, an AC power port, and at least one network communications port. The AC power ports of respective lighting fixtures are coupled together with a plurality of industrial power cables without using one or more conduits for the plurality of industrial power cables. The network communications ports of the respective lighting fixtures are coupled together with a plurality of waterproof network communications cables. In one example, a lighting system kit comprises two or more lighting fixtures having an AC power port comprising an industrial type connector. The kit further comprises multiple industrial power cables and one or more industrial drop tee cables.

CROSS-REFERENCE TO RELATED PATENT APPLICATION(S)

This application is a continuation of, and claims priority to, U.S.application Ser. No. 17/317,792, filed May 11, 2021, entitled “LIGHTINGSYSTEM AND SENSOR PLATFORM FOR CONTROLLED AGRICULTURAL ENVIRONMENTS,”which is a continuation of, and claims priority to, U.S. applicationSer. No. 16/404,192, filed May 6, 2019, entitled “FLUID-COOLED LIGHTINGSYSTEMS AND KITS FOR CONTROLLED AGRICULTURAL ENVIRONMENTS, AND METHODSFOR INSTALLING SAME,” which, in turn, claims a priority benefit to U.S.Provisional Application No. 62/667,217, filed May 4, 2018, entitled“METHODS, APPARATUS, AND SYSTEMS FOR DISTRIBUTED SENSING IN CONTROLLEDAGRICULTURAL ENVIRONMENTS” and U.S. Provisional Application No.62/684,641, filed Jun. 13, 2018, entitled “METHODS, APPARATUS, ANDSYSTEMS FOR DISTRIBUTED SENSING IN CONTROLLED AGRICULTURALENVIRONMENTS”, and is also a continuation-in-part (CIP) of U.S.application Ser. No. 16/390,501, filed Apr. 22, 2019, entitled“INTEGRATED SENSOR ASSEMBLY FOR LED-BASED CONTROLLED ENVIRONMENTAGRICULTURE (CEA) LIGHTING, AND METHODS AND APPARATUS EMPLOYING SAME,”which, in turn, claims priority to U.S. Provisional Application No.62/660,720, filed Apr. 20, 2018, entitled “INTEGRATED SENSOR ASSEMBLYFOR WATER-COOLED LED-BASED CONTROLLED ENVIRONMENT AGRICULTURE (CEA)LIGHTING” and is also a continuation-in-part (CIP) of U.S. applicationSer. No. 16/114,088, filed Aug. 27, 2018, entitled “FLUID-COOLEDLED-BASED LIGHTING METHODS AND APPARATUS FOR CONTROLLED ENVIRONMENTAGRICULTURE,” which, in turn, claims priority to U.S. ProvisionalApplication No. 62/550,379, filed Aug. 25, 2017, entitled “WATER-COOLEDLED-BASED LIGHTING METHODS AND APPARATUS FOR CONTROLLED ENVIRONMENTAGRICULTURE” and U.S. Provisional Application No. 62/635,499, filed Feb.26, 2018, entitled “WATER-COOLED LED-BASED LIGHTING METHODS ANDAPPARATUS FOR CONTROLLED ENVIRONMENT AGRICULTURE.” Each of theaforementioned applications is incorporated herein by reference in itsentirety.

BACKGROUND

Controlled Environment Agriculture (CEA) is the process of growingplants in a controlled environment where various environmentalparameters are monitored and adjusted to improve the quality and yieldof the plants grown. Compared to conventional approaches of plantcultivation, CEA may enable year-round production of plants,insensitivity to variable weather conditions, reduce pests and diseases,and reduce the amount of resources consumed on a per plant basis. Acontrolled agricultural environment is typically enclosed, at least inpart, by a building structure such as a greenhouse, a grow room, or acovered portion of a field in order to provide some degree of controlover environmental conditions. Additional control systems may bedeployed to adjust various environmental parameters including lighting,temperature, humidity, nutrient levels, and carbon dioxide (CO2)concentrations. For example, one or more artificial lighting systems areoften used in such controlled agricultural environments to supplementand/or replace natural sunlight that may be obstructed by the buildingstructure or insufficient during certain periods of the year (e.g.,winter months).

SUMMARY

In conventional CEA, multiple sensors are often deployed and utilized tomonitor growth conditions in a growing area. The integration of sensorsin various agricultural settings is typically based on two generaldesign approaches: (1) a wireless sensor network (WSN) system and (2) anInternet of Things (IoT) system. For both WSN systems and IoT systems,each sensor deployed in the environment typically communicateswirelessly and relies upon a battery for power.

WSN and IoT sensor systems may in some instances provide for ease ofinstallation and flexible deployment, particularly over larger growingenvironments. The Inventors have recognized and appreciated, however,that wireless sensor systems for agricultural applications may besignificantly limited by (1) the reliance on a portable power source(e.g., a battery), which needs to be periodically replenished orreplaced and (2) reliability issues that arise due to shadowing effectsof plants in the environments (e.g., a sufficient density of leaves mayobstruct and, in some instances, block wireless communication).

In view of the foregoing, the Inventors have contemplated sensorconfigurations for CEA to provide for more robust and reliable operationof sensors. For example, in one aspect, providing wired rather thanwireless power and network communication resources to sensors in anagricultural setting arguably would increase their robustness andreliability; at the same time, providing sufficient cabling to powerand/or communicate with each sensor in the environment may imposecertain burdens to installers in, or operators of, the agriculturalenvironment.

The Inventors have recognized and appreciated, however, that lightingsystems employed in CEA may serve as a platform for distributing wiredpower and providing a wired network communications infrastructure formultiple other devices deployed and utilized in a controlledagricultural environment. By leveraging the lighting system to supportthe operation of various sensors and other devices, these sensors anddevices may be easily positioned to cover regions of the environmentrelevant to the growth of plants (e.g., since the lighting fixtures aredeployed in areas where plants are located).

More specifically, a lighting system for CEA is often deployed in agrowing area in a substantially regular arrangement (e.g., of rows andcolumns of lighting fixtures above shelves of plants) to ensure asubstantially even distribution of light in the environment(photosynthetically active radiation, or PAR). The Inventors haverecognized and appreciated that the arrangement of lighting fixtures ina given growing area may be employed to divide the space of the growingarea into a multidimensional grid of nodes, for which the lightingsystem may provide one or both of operating power and networkcommunication access points in respective nodes of the grid.

For example, the space of a given growing area may be defined by threeorthogonal axes (e.g., an x-axis along the width of the space, a y-axisalong the length of the space, and a z-axis along the height of thespace). Respective lighting fixtures of a lighting system may bepositioned at a certain height (z_(lights)) in the space and atcorresponding positions (x_(i), y_(i)) along the width and length of thespace. The respective positions of the lighting fixtures may in turn beused to define a multidimensional grid of nodes in the space for whichthe lighting system may provide one or both of operating power andnetwork communications connections (e.g., Ethernet transmit/receiveaccess) to one or more devices (e.g., a sensor or actuator) situated ator near one or more of the nodes. In such an exemplary framework, at agiven lighting fixture position (x_(i), y_(i)) along the width andlength of the space, multiple sensors may be deployed at differentheights along the z-axis (e.g., different vertical levels of theagricultural environment, such as a soil level, a plant level, a lightcanopy level, and an ambient environment level).

Thus, the Inventors have recognized and appreciated the practicaladvantages of an industrial horticultural lighting system for CEA thatserves as a power and network communications “backbone” in a growingarea to provide for significant flexibility, reliability and robustnessin the deployment of other apparatus useful for CEA (e.g., sensors andactuators). The Inventors further have recognized and appreciated thepractical advantages of designing respective components of such alighting system to significantly facilitate safe, efficient andrelatively inexpensive assembly and installation of the lighting systemin a given growing area.

To this end, industrial horticultural lighting systems are describedherein in which respective lighting fixtures of the system includeindustrial-type AC power connectors, and respective cables of the systemare industrial type cables (e.g., multi-point interconnection powercable assemblies for industrial machinery according to the UnderwritersLaboratory (UL®) product category PVVA and compliant with the UL®standard 2237). The use of industrial type connectors and cables toprovide operating power to respective lighting fixtures of the systemsignificantly facilitates an essentially “tool-less” lighting systemassembly and installation process in a growing area (e.g., in which noconduit is required for running electrical wires). In one exampleimplementation, multiple lighting fixtures may be daisy-chained togethervia industrial power cables (e.g., that ultimately connect directly to abreaker panel in the controlled agricultural environment).

In another aspect, respective lighting fixtures of an industrialhorticultural lighting system are equipped with one or more networkcommunication ports (e.g., RJ45 ports for Ethernet or Power overEthernet), and waterproof network communication cables (e.g., Cat-5 orother categories of Ethernet cables) are employed to interconnect thenetwork communication ports of respective lighting fixtures. In thismanner, the lighting system may be washed down from time to time oncedeployed in the controlled agricultural environment. In yet anotheraspect, integrated sensor assemblies comprising multiple sensors may bereadily coupled via a variety of cabling and wired connection assemblies(gooseneck flexible conductors, angled connectors, variable lengthcables) to one or more power and communication ports of a given lightingfixture (e.g., PoE ports or USB ports on the lighting fixtures) toprovide for a multidimensional distributed sensing network in thegrowing area. In yet another aspect, respective lighting fixtures of thelighting system may be fluid-cooled fixtures, and pipes carryingfluid-coolant through respective lighting fixtures may be coupledtogether readily using a variety of push-to-connect plumbing fittings,thereby further facilitating system assembly and installation.

Distributed sensing techniques according to the present disclosure maybe used to systematically monitor growth conditions for plants across anagricultural environment. Data collected by multiple sensors deployed inthe controlled agricultural environment can be analyzed and displayedaccording to a variety of modalities, for example, via a sophisticatedhuman-machine interface (HMI). Distributed sensors in the controlledagricultural environment may also be coupled to one or more controlsystems in a feedback loop where data acquired by one or more of thedistributed sensors may be used to adjust the one or more controlsystems (e.g., to improve or maintain growth conditions in theagricultural environment).

In one exemplary implementation, multiple sensors are deployed in acontrolled agricultural environment as a distributed sensor grid. Thedistributed sensor grid includes one or more node arrays, where eachnode array divides at least a portion of the controlled agriculturalenvironment into nodes, e.g., discrete points in space which have aknown location (e.g., absolute or relative) in the environment. Invarious aspects, a given node array of a distributed sensor grid may beone dimensional, two dimensional, or three dimensional (e.g., based atleast in part on the distribution of growing areas and/or crops in thecontrolled agricultural environment). For example, in someimplementations, a given node array may include multiple nodes arrangedin a substantially linear or curvilinear fashion spaced along a row ofplants to provide a one-dimensional node array. Another type of nodearray may include multiple nodes arranged in a horizontal planesubstantially parallel to a floor or a ceiling in the controlledagricultural environment to provide a two-dimensional node array. Yetanother type of node array may include multiple nodes arranged inmultiple horizontal planes substantially parallel to the floor orceiling in the controlled agricultural environment, wherein therespective horizontal planes of nodes constitute multiple verticallevels corresponding to different zones of interest in the controlledgrowing environment (e.g., the soil, the plant, the lighting canopy, andthe ambient environment).

In another aspect of such node arrays, one or more sensors are deployedat a given node to monitor various environmental conditions near thenode. Examples of sensors that may be included in the distributed sensorgrid at a given node of a node array include, but are not limited to, avisible light sensor, a UV light sensor, an air temperature sensor, arelative humidity sensor, an airflow sensor, a CO2 sensor, an IRtemperature sensor, a chemical sensor, a pH sensor, and camerasconfigured to capture still images or videos of the agriculturalenvironment with various spectral qualities. Thus, the distributedsensor grid including one or more node arrays in the controlledagricultural environment may be employed to systematically monitor avariety of environmental conditions relevant to the growth of plants asa function of location in the agricultural environment. In anotheraspect, common power and network connections may also be employed tofacilitate connectivity between various nodes in the distributed sensorgrid.

In some implementations, the controlled agricultural environmentincludes multiple fluid-cooled LED-based lighting fixtures, as describedherein. In these implementations, the distributed sensor grid, at leastin part, may be integrated with the LED-based lighting fixtures suchthat the fixtures provide a platform for the distribution of sensorsdisposed at one or more nodes of the distributed sensor grid. Forexample, the LED-based lighting fixtures can include network, electricalpower, and plumbing connections to facilitate an assembly of multiplelighting fixtures in the controlled agricultural environment, and thelighting fixtures in turn provide networking and electrical connectivityto and between one or more sensors disposed at respective nodes of thesensor grid. In some implementations, each lighting fixture includes oneor more ports (e.g., Power over Ethernet, USB) to which an integratedsensor assembly may be coupled, wherein the integrated sensor assemblyincludes multiple sensors to monitor growth conditions. Thus, theplacement of such lighting fixtures in the controlled agriculturalenvironment may in part define different nodes of the distributed sensorgrid at which one or more integrated sensor assemblies may be deployed.By leveraging the power and network connections provided by the lightingfixtures, the integrated sensor assemblies can be connected to oneanother, thus forming a distributed sensor grid.

In some implementations, the distributed sensor grid can be coupled to aprocessor, e.g., a computer or a server, which stores and processesvarious data obtained by respective sensors in the distributed sensorgrid. The processor (e.g., computer or server) also may provide for agraphical user interface, referred to herein as a “human machineinterface” (HMI), to allow curators/operators of the controlledagricultural environment (“users”) to monitor and control variousaspects of the agricultural environment (e.g., access various dataobtained by the sensors, view and display various results relating toanalysis of data obtained by respective sensors, control one or more oflighting, temperature, humidity, air flow, and air quality in thecontrolled agricultural environment). In one aspect, the HMI can enableusers to display data and analytical results pertaining to one or morenodes of the distributed sensor grid on a node-by-node basis or on thebasis of particular groups of nodes. Sensor data may be viewed inreal-time, and historical data may be viewed as a function time in awide variety of manners. Additionally, the HMI provides an interface topermit users to automate, at least in part, various controllableconditions in the agricultural environment based on data obtained by oneor more sensors of the distributed sensor grid.

By way of example, the distributed sensor grid can incorporateintegrated sensor assemblies and fluid-cooled LED-based lightingfixtures described in U.S. Patent Application No. U.S. 62/660,720entitled, “Integrated sensor assembly for water-cooled LED-basedcontrolled environment agricultural (CEA) lighting,” filed on Apr. 20,2018, the disclosure of which is incorporated herein by reference in itsentirety. It should be appreciated that all combinations of theforegoing concepts and additional concepts discussed in greater detailbelow (provided such concepts are not mutually inconsistent) arecontemplated as being part of the inventive subject matter disclosedherein.

In sum, one implementation is directed to an industrial horticulturallighting system for controlled environment agriculture (CEA), thelighting system comprising: A) a first lighting fixture comprising: afirst housing; at least one first light source mechanically supported bythe first housing; at least one first pipe thermally coupled to thefirst housing to carry a fluid coolant, wherein during operation of thefirst lighting fixture the fluid coolant flowing through the at leastone first pipe extracts heat generated by the first lighting fixture;and a first AC power port comprising a first industrial type connector;B) a second lighting fixture comprising: a second housing; at least onesecond light source mechanically supported by the second housing; atleast one second pipe thermally coupled to the second housing to carrythe fluid coolant, wherein during operation of the second lightingfixture the fluid coolant flowing through the at least one second pipeextracts heat generated by the second lighting fixture; and a second ACpower port comprising a second industrial type connector; C) a firstindustrial power cable coupled to the first industrial type connectorconstituting the first AC power port of the first lighting fixture, thefirst power cable having a first connector (P1) and a second connector(P2); D) an industrial drop tee cable, coupled to the first power cableand the second industrial type connector constituting the second ACpower port of the second lighting fixture, the drop tee cable having afirst connector (P1), a second connector (P2), and a third connector(P3); and E) a second industrial power cable coupled to the drop teecable, the second power cable having a first connector (P1) and a secondconnector (P2).

Another example implementation is directed to a lighting system kit,comprising: A) X lighting fixtures, wherein X is an integer having avalue of at least two, each lighting fixture of the X lighting fixturescomprising: a housing; at least one light source mechanically supportedby the housing; at least one pipe thermally coupled to the housing tocarry a fluid coolant, wherein during operation of the lighting fixturethe fluid coolant flowing through the at least one pipe extracts heatgenerated by the lighting fixture; and an AC power port comprising anindustrial type connector; B) X industrial power cables, each industrialpower cable having a first connector and a second connector; and C) Yindustrial drop tee cables, wherein Y is an integer having a value lessthan X, each drop tee cable having a first connector, a secondconnector, and a third connector.

Another example implementation is directed to a method of installing alighting system comprising at least two lighting fixtures, each lightingfixture of the at least two lighting fixtures comprising a housing, atleast one light source mechanically supported by the housing, at leastone pipe thermally coupled to the housing to carry a fluid coolant, anAC power port, and at least one network communications port, the methodcomprising: A) coupling together the AC power port of respectivelighting fixtures of the at least two lighting fixtures with a pluralityof industrial power cables without using one or more conduits for theplurality of industrial power cables; and B) coupling together the atleast one network communications port of the respective lightingfixtures of the at least two lighting fixtures with a plurality ofwaterproof network communications cables.

Another example implementation is directed to a distributed sensorsystem comprising: a first plurality of integrated sensor assembliesdistributed along (1) a first horizontal axis at approximately orsubstantially regular intervals defined by a first pitch and (2) avertical axis at intervals corresponding to a first set of verticallevels of an agricultural environment, wherein: the first horizontalaxis is substantially orthogonal to the vertical axis; and the firstpitch of the first plurality of integrated sensor assemblies along thefirst horizontal axis substantially corresponds to respective positionsof a first plurality of lighting fixtures disposed in the agriculturalenvironment substantially along the first horizontal axis.

Another example implementation is directed to a distributed sensorsystem comprising: a first plurality of integrated sensor assembliesdistributed along (1) a first horizontal axis at approximately orsubstantially regular intervals defined by a first pitch and (2) avertical axis at intervals corresponding to a first set of levels of anagricultural environment, wherein: the first horizontal axis issubstantially orthogonal to the vertical axis; and each integratedsensor assembly in the first plurality of integrated sensor assembliesis mechanically coupled to one of a cable or a port that supplies atleast one of power or network communication access to the integratedsensor assembly.

Another example implementation is directed to a distributed lighting andsensing system for controlled environment agriculture (CEA) in a growingarea space defined by three orthogonal axes including a first axis (x)along a width of the growing area space, a second axis (y) along alength of the growing area space, and third axis (z) along a height ofthe growing area space, the system comprising: a lighting system,comprising: a first lighting fixture at a first position (x₁, y₁) in aplane defined by the first axis and the second axis of the growing areaspace and at a first height (z_(light)) along the third axis of thegrowing area space and; and a second lighting fixture at a secondposition (x₂, y₂) in the plane defined by the first axis and the secondaxis of the growing area space and at the first height (z_(light)) alongthe third axis of the growing area space, wherein the first position(x₁, y₁) of the first lighting fixture at the first height (z_(light))and the second position (x₂, y₂) of the second lighting fixture at thefirst height (z_(light)) define a multidimensional grid of nodes in thegrowing area space at which the lighting system provides at least one ofoperating power or network communications access to respective nodes ofthe multidimensional grid of nodes; and a sensing system, comprising: afirst sensor situated at or near a first node (x₁, y₁, z₁) of themultidimensional grid of nodes, the first sensor coupled to the firstlighting fixture to receive the at least one of operating power ornetwork communication access from the first lighting fixture; and asecond sensor situated at or near a second node (x₂, y₂, z₂) of themultidimensional grid of nodes, the second sensor coupled to the secondlighting fixture to receive the at least one of operating power ornetwork communication access from the second lighting fixture, whereinz₁ and z₂ are different. In one aspect, x₁=x₂ or y₁=y₂ such that themultidimensional grid of nodes is a two-dimensional array of nodes. Inanother aspect, x₁ and x₂ are different, and y₁ and y₂ are different,such that the multidimensional grid of nodes is a three-dimensionalarray of nodes.

It should be appreciated that all combinations of the foregoing conceptsand additional concepts discussed in greater detail below (provided suchconcepts are not mutually inconsistent) are contemplated as being partof the inventive subject matter disclosed herein. In particular, allcombinations of claimed subject matter appearing at the end of thisdisclosure are contemplated as being part of the inventive subjectmatter disclosed herein. It should also be appreciated that terminologyexplicitly employed herein that also may appear in any disclosureincorporated by reference should be accorded a meaning most consistentwith the particular concepts disclosed herein.

BRIEF DESCRIPTION OF THE DRAWINGS

The patent or application file contains at least one drawing executed incolor. Copies of this patent or patent application publication withcolor drawing(s) will be provided by the Office upon request and paymentof the necessary fee.

The skilled artisan will understand that the drawings primarily are forillustrative purposes and are not intended to limit the scope of theinventive subject matter described herein. The drawings are notnecessarily to scale; in some instances, various aspects of theinventive subject matter disclosed herein may be shown exaggerated orenlarged in the drawings to facilitate an understanding of differentfeatures. In the drawings, like reference characters generally refer tolike features (e.g., functionally similar and/or structurally similarelements).

FIG. 1 is an illustration of a conventional controlled agriculturalenvironment where one or more HPS lamps are used.

FIG. 2 is an illustration of a conventional controlled agriculturalenvironment where one or more conventional LED-based lighting fixturesare used.

FIG. 3 is an illustration of a controlled agricultural environment whereone or more fluid-cooled LED-based lighting fixtures are retrofit into apre-existing environment, according to some implementations of thedisclosure.

FIG. 4 is an illustration of a controlled agricultural environment whereone or more fluid-cooled LED-based lighting fixtures are coupled to ahydronics system, according to some implementations of the disclosure.

FIG. 5 is a block diagram of a lighting fixture, according to someimplementations of the disclosure.

FIG. 6A is a circuit diagram detailing a first half of an exemplary LEDmodule of a lighting fixture, according to some implementations of thedisclosure.

FIG. 6B is a circuit diagram detailing the second half of the exemplaryLED module of FIG. 6B.

FIG. 7A shows a bottom, front perspective view of a lighting fixture,according to some implementations of the disclosure.

FIG. 7B shows front, bottom, left side, and right side views of thelighting fixture of FIG. 7A.

FIG. 7C shows a cross-sectional view of the lighting fixture of FIG. 7Balong the plane A-A.

FIG. 8A shows a top perspective view of a first lighting fixture coupledto a second lighting fixture and a support structure, according to someimplementations of the disclosure.

FIG. 8B shows a perspective view of a controlled agriculturalenvironment showing multiple rows of fluid-cooled LED-based lightingfixtures coupled together forming a continuous electrical and coolantcircuit, according to some implementations of the disclosure.

FIG. 8C shows an exemplary assembly of power cables and a drop teecable.

FIG. 8D shows a perspective view of the drop tee cable of FIG. 8C.

FIG. 8E shows a front view of the drop tee cable of FIG. 8C.

FIG. 8F shows a bottom view of the drop tee cable of FIG. 8C.

FIG. 8G shows a left-side view of the drop tee cable of FIG. 8C.

FIG. 8H-1 shows a wiring diagram for the drop tee cable of FIG. 8C.

FIG. 8H-2 shows a right-side view of the drop tee cable of FIG. 8C basedon the wiring diagram of FIG. 8H-1 .

FIG. 8H-3 shows a left-side view of the drop tee cable of FIG. 8C basedon the wiring diagram of FIG. 8H-1 .

FIG. 8I shows a perspective view of the power cable of FIG. 8C.

FIG. 8J shows a top view of the power cable of FIG. 8C.

FIG. 8K shows a right-side view of the power cable of FIG. 8C.

FIG. 8L shows a left-side view of the power cable of FIG. 8C.

FIG. 8M shows a wiring diagram for the power cable of FIG. 8C.

FIG. 8N shows a perspective view of an exemplary waterproof Ethernetcable.

FIG. 8O shows a top view of the waterproof Ethernet cable of FIG. 8N.

FIG. 8P shows an expanded front view one portion of the waterproofEthernet cable of FIG. 8N.

FIG. 8Q-1 shows an exemplary outlet.

FIG. 8Q-2 shows an exemplary power cable.

FIG. 8Q-3 shows a portion of an exemplary drop tee cable.

FIG. 8Q-4 shows another exemplary drop tee cable.

FIG. 8Q-5 shows yet another exemplary drop tee cable.

FIG. 8R shows an exemplary assembly of a waterproof Ethernet cable and apower cable coupled to the lighting fixture of FIGS. 7A-7C.

FIG. 9A shows an exemplary hydronics system including a fluid storagetank and multiple piping subsystems such as a lighting loop, a heatingloop, and a cooling loop, according to some implementations of thedisclosure.

FIG. 9B shows a portion of an exemplary hydronics system coupled to alighting fixture and a growing area, according to some implementationsof the disclosure.

FIG. 9C shows a controlled agricultural environment where one or morefluid-cooled LED-based lighting fixtures are disposed in avertically-stacked multiple-level growing area and coupled to ahydronics system, according to some implementations of the disclosure.

FIG. 10A shows a side view of a controlled agricultural environment witha plurality of fluid-cooled LED-based lighting fixtures and a pluralityof sensors to facilitate monitoring of environmental conditions,according to some implementation of the disclosure.

FIG. 10B shows a side view of an exemplary lighting system with a singlelighting fixture.

FIG. 10C shows a top view of the lighting system of FIG. 10B.

FIG. 10D shows a side view of an exemplary lighting system with twocoupled lighting fixtures.

FIG. 10E shows a top view of the lighting system of FIG. 10D.

FIG. 10F shows a side view of an exemplary lighting system with threecoupled lighting fixtures.

FIG. 10G shows a top view of the lighting system of FIG. 10F.

FIG. 11A is a block diagram detailing various electronics components ofa processor including a control board, a network board, and a singleboard computer, according to some implementations of the disclosure.

FIG. 11B is a block diagram providing additional detail of the controlboard of FIG. 11A.

FIG. 11C is a block diagram providing additional detail of the networkboard of FIG. 11A.

FIG. 12A is a circuit diagram detailing various electronic components ofa network board, according to some implementations of the disclosure.

FIG. 12B is an expanded view of the Ethernet switch of FIG. 12A.

FIG. 12C is an expanded view of the PoE port of FIG. 12A.

FIG. 12D is a circuit diagram of the PoE controller of FIG. 12A.

FIG. 13 is a circuit diagram of a single board computer, according tosome implementations of the disclosure.

FIG. 14A is a circuit diagram detailing various electrical components ofa control board, according to some implementations of the disclosure.

FIG. 14B is a circuit diagram detailing the bias and control powersupply of the control board of FIG. 14A.

FIG. 14C is a circuit diagram detailing the DC-DC converter of thecontrol board of FIG. 14A.

FIG. 14D is a circuit diagram detailing the AC line sensor of thecontrol board of FIG. 14A.

FIG. 14E is a circuit diagram detailing the DSP of the control board ofFIG. 14A.

FIG. 14F is a circuit diagram detailing the temperature sensor circuitryof the control board of FIG. 14A.

FIG. 14G is a circuit diagram detailing the boost circuit of the controlboard of FIG. 14A.

FIG. 14H is a circuit diagram further detailing the boost circuit ofFIG. 14G.

FIG. 15A is a flow diagram of a contract enforcement method, accordingto some implementations of the disclosure.

FIG. 15B is a flow diagram of a method to update a license in a leasedlighting system, according to some implementations of the disclosure.

FIG. 16A is a top perspective view of an integrated sensor assemblyaccording to some implementations of the disclosure.

FIG. 16B is a bottom perspective view of the integrated sensor assemblyshown in FIG. 16A according to some implementations of the disclosure.

FIG. 16C is an exploded side view of the integrated sensor assemblyshown in FIG. 16A according to some implementations of the disclosure.

FIG. 16D is an exploded top perspective view the integrated sensorassembly shown in FIG. 16A according to some implementations of thedisclosure.

FIG. 16E is a top view the integrated sensor assembly shown in FIG. 16Aaccording to some implementations of the disclosure.

FIG. 16F is a side view of the integrated sensor assembly shown in FIG.16A detailing the field of view of various sensors according to someimplementations of the disclosure.

FIG. 17A shows a circuit diagram of the various sensors incorporatedinto an integrated sensor assembly according to some implementations ofthe disclosure.

FIG. 17B shows a circuit diagram of electrical components and circuitrythat support the operation of various sensors incorporated into anintegrated sensor assembly according to some implementations of thedisclosure.

FIG. 18 illustrates an integrated sensor assembly coupled to a downwardor bottom USB port of the lighting fixture shown in FIGS. 7A and 7B viaone or more USB couplers/extenders, according to some implementations ofthe disclosure.

FIG. 19 illustrates an integrated sensor assembly coupled to a side orend USB port of the lighting fixture shown in FIGS. 7A and 7B via one ormore USB couplers/extenders, according to some implementations of thedisclosure.

FIG. 20A shows an exemplary distributed sensor system, according to someimplementations of the disclosure.

FIG. 20B-1 shows a top view of an exemplary node array in a distributedsensor system with two plant shelves, according to some implementationsof the disclosure.

FIG. 20B-2 shows a front view of the node array of FIG. 20B-1 .

FIG. 20B-3 shows a side view of the node array of FIG. 20B-1 .

FIG. 20B-4 shows a perspective view of the node array of FIG. 20B-1 .

FIG. 20C shows a side view of an exemplary distributed sensor systemsubdivided along a vertical axis into levels corresponding to theagricultural environment.

FIG. 20D-1 shows a top view of another exemplary node array in adistributed sensor system with one shelf, according to someimplementations of the disclosure.

FIG. 20D-2 shows a front view of the node array of FIG. 20D-1 .

FIG. 20D-3 shows a perspective view of the node array of FIG. 20D-1 .

FIG. 20D-4 shows a side view of the node array of FIG. 20D-1 .

FIG. 20E-1 shows a front view of another exemplary node array in adistributed sensor system with numerous plant shelves, according to someimplementations of the disclosure.

FIG. 20E-2 shows a top view of the node array of FIG. 20E-1 .

FIG. 20E-3 shows a side view of the node array of FIG. 20E-1 .

FIG. 20E-4 shows a perspective view of the node array of FIG. 20E-1 .

FIG. 20E-5 shows another perspective view of the node array of FIG.20E-1 .

FIG. 21A shows an exemplary human machine interface (HMI) displayed on amonitor of a computer, according to some implementations of thedisclosure.

FIG. 21A-1 shows an expanded view of a portion of the HMI of FIG. 21Alabeled “See FIG. 21A-1 .”

FIG. 21B shows a top view of a plant shelf as displayed in the HMI ofFIG. 21A.

FIG. 21C shows a side view of the plant shelf of FIG. 21B as displayedin the HMI.

FIG. 21D shows a top view of two exemplary plant shelves as displayed inthe HMI of FIG. 21A.

FIG. 21E shows a side view of the plant shelves of FIG. 21D as displayedin the HMI of FIG. 21A.

FIG. 21F shows a top view of another exemplary plant shelf as displayedin the HMI of FIG. 21A.

FIG. 21G shows a side view of the plant shelf of FIG. 21F where thenodes are subdivided into levels that correspond to different regions ofthe agricultural environment.

FIG. 21H shows a chart of various sensory data recorded by an integratedsensor assembly as a function of time as displayed in the HMI of FIG.21A.

FIG. 21I shows another chart of various sensory data as a function oftime and a scheduling chart as displayed in the HMI of FIG. 21A.

FIG. 21I-1 shows an expanded view of a portion of the chart of FIG. 21Ilabeled as “See FIG. 21I-1 .”

FIG. 21J shows another chart of various sensory data as a function oftime, a scheduling chart, and a 3D plot of sensory data as displayed inthe HMI of FIG. 21A.

FIG. 21J-1 shows an expanded view of a portion of the chart of FIG. 21Jlabeled as “See FIG. 21J-1 .”

FIG. 21J-2 shows an expanded view of a portion of the chart of FIG. 21Jlabeled as “See FIG. 21J-2 .”

FIG. 21K shows an exemplary image or video frame of the agriculturalenvironment as displayed in the HMI of FIG. 21A.

FIG. 22A shows a top view of a simulated air flow distribution in anagricultural environment, according to some implementations of thedisclosure.

FIG. 22B shows a side view of the air flow distribution of FIG. 22A.

FIG. 22C shows a perspective view of the air flow distribution of FIG.22A.

DETAILED DESCRIPTION

Following below are more detailed descriptions of various conceptsrelated to, and implementations of, methods, apparatus and systems forlighting and distributed sensing in a controlled agriculturalenvironment. It should be appreciated that various concepts introducedabove and discussed in greater detail below may be implemented inmultiple ways. Examples of specific implementations and applications areprovided primarily for illustrative purposes so as to enable thoseskilled in the art to practice the implementations and alternativesapparent to those skilled in the art.

The figures and example implementations described below are not meant tolimit the scope of the present implementations to a single embodiment.Other implementations are possible by way of interchange of some or allof the described or illustrated elements. Moreover, where certainelements of the disclosed example implementations may be partially orfully implemented using known components, in some instances only thoseportions of such known components that are necessary for anunderstanding of the present implementations are described, and detaileddescriptions of other portions of such known components are omitted soas not to obscure the present implementations.

Controlled Environment Agriculture (CEA) is the process of growingplants in a controlled environment where various environmentalparameters, such as lighting, temperature, humidity, nutrient levels,and carbon dioxide (CO2) concentrations are monitored and adjusted toimprove the quality and yield of the plants. Compared to conventionalapproaches of plant cultivation, CEA may enable year-round production ofplants, insensitivity to variable weather conditions, reduce pests anddiseases, and reduce the amount of resources consumed on a per plantbasis. Additionally, CEA may support various types of growing systemsincluding, but not limited to soil-based systems and hydroponicssystems.

For an environment utilizing CEA, sensors should preferably be deployedthroughout the environment to monitor various environmental parameterspertinent to the growth of different plant species contained within theenvironment. Various types of sensors may be deployed to monitor variousenvironmental parameters including, but limited to, air temperature,leaf temperature, air flow, relative humidity, lighting conditions(e.g., spectral intensity, radiant intensity such as the photosyntheticflux density), CO2 concentrations, pH levels in the soil, and airpollution. These environmental parameters may also vary as a function oflocation within the environment. For example, the air flow rate above alighting fixture may differ substantially from the air flow rate justabove the plants.

The data recorded by the sensors may be used to provide insight onvarious aspects of plant development including, but not limited to thehealth of the plants, yield rates, and projected harvest dates. The datamay also be used to provide feedback to various control systems deployedin the environment in order to adjust the environmental parametersdescribed above. These control systems may include, but are not limitedto, lighting systems, heating/cooling systems (e.g., hydronics, airconditioning), air flow systems, and humidity conditioning systems.

Conventional sensors in CEA systems, however, are typically designed anddeployed irrespective of other sensors disposed in the environment andthe control systems to which they may be coupled to. For example,different types of sensors may each have to be installed separately evenif the sensors are monitoring the same region of the environment. Insome instances, a separate platform or support structure may beinstalled (e.g., a frame, a rafter) to enable the sensors to monitor anotherwise inaccessible region of the environment (e.g., right above theplants). In another example, each type of sensor deployed in theenvironment may be connected to a power source and/or a control system(e.g., a computer) using a proprietary connection mechanism (e.g.,different types of cables). In an environment where numerous sensors maybe deployed, the integration of the sensors into the CEA system may behindered by practical limitations related to separately connecting eachsensor to the power source/control system. In yet another example, eachsensor may be communicatively coupled to a control system using aseparate system (e.g. a different interface on a computer, differentcommunication channels), which further increase the difficulty inleveraging multiple sensors to monitor and control the environment.

In order to overcome these challenges, conventional CEA systems andother agricultural applications have relied upon wireless sensors usedin a wireless sensor network (WSN) system or an Internet of Things (IoT)system. The WSN and IoT systems have enabled deployment of sensors overlarge agricultural spaces. However, the sensors are typically powered bya battery, which should be periodically replaced or recharged in thefield. For a CEA system comprising hundreds or thousands of sensors, theadded cost for batteries and time for labor is undesirable.Additionally, wireless communication may be hindered by obstructions inthe environment. For example, sensors deployed to monitor soilconditions may be blocked by plant leaves.

The present disclosure is thus directed to various implementations of adistributed sensor grid for controlled agricultural environments,respective components of such distributed sensor grids, and methods ofassembling and using the distributed sensor grid. In one aspect, thesensors deployed in the distributed sensing systems may be wired (asopposed to being wireless) in order to provide a persistent source ofpower. In order to overcome the challenge of connecting each sensor to acommon power source and/or network node for communication, a pluralityof lighting fixtures disposed in the environment may be configured tosupply power and/or communication to each sensor. The lightingfixture(s), which may be electrically and communicatively coupled to oneanother, may thus serve as a platform to support the sensors in thedistributed sensing systems. Each sensor may be coupled to a lightingfixture rather than having to be routed to a common power source orcommunication node, thus simplifying installation and integration.

By leveraging the lighting fixtures to support the operation of varioussensors, the distributed sensing system naturally covers regions of theenvironment relevant to the growth of plants (i.e., the lightingfixtures are deployed in areas where plants are located). In anotheraspect, the sensors used in the distributed sensing system may thus bedeployed at locations in the environment where lighting fixtures arelocated.

The distributed sensor grid may include one or more node arrays thatdivide an agricultural environment into nodes, e.g., discrete points inspace, with known locations in the environment. Each node can includeone or more sensors to monitor the environmental conditions proximate tothe node. The nodes may be further differentiated according to levelsthat correspond to various parts of a plant system. The nodes in thenode array may also share power and network connections to simplify theintegration of various sensor modalities in the distributed sensor gridand to improve ease of use in storing, accessing, and processing datafrom said sensor modalities. A processor may also be coupled to thedistributed sensor grid to facilitate user interaction via a humanmachine interface.

Exemplary implementations of a distributed sensor grid are based, inpart, on concepts related to fluid-cooled LED-based lighting fixturesand integrated sensor assemblies deployed in controlled agriculturalenvironments. Accordingly, example implementations of a fluid-cooledLED-based lighting fixture and an integrated sensor assembly aredescribed below in the first instance to provide illustrative contextfor inventive implementations of the distributed sensor grid describedin the present disclosure.

An Exemplary Lighting Fixture and Lighting System for CEA

A controlled agricultural environment is typically enclosed, at least inpart, by a building structure such as a greenhouse, a grow room, or acovered portion of a field in order to provide some degree of controlover environmental conditions. One or more artificial lighting systemsare often used in such controlled agricultural environments tosupplement and/or replace natural sunlight that may be obstructed by thebuilding structure or insufficient during certain periods of the year(e.g., winter months). The use of an artificial lighting system may alsoprovide yet another measure of control where the intensity and spectralcharacteristics of the lighting system may be tailored to improve thephotosynthetic rates of plants. Various types of artificial lightingsystems may be used including, but not limited to, a high intensitydischarge lamp, a light emitting diode (LED), and a fluorescent lamp.

Artificial lighting systems, however, generate heat, which whendissipated into the environment may contribute significantly to thecooling load of the controlled agricultural environment. In order toaccommodate the higher cooling load and thus maintain the controlledagricultural environment within a desired temperature envelope, thecooling capacity of a cooling system may need to be increased resultingin greater energy consumption. For a controlled agricultural environmenton a variable energy budget, greater energy consumption may lead tohigher energy costs. Alternatively, for a controlled environment on afixed energy budget, a larger portion of the energy budget may beconsumed by the cooling system, thus reducing the energy and capacityavailable to support a larger crop size and yield.

To illustrate the impact excess heat generated by an artificial lightingsystem may have on energy consumption, FIG. 1 shows a conventionalcontrolled agricultural environment with one or more high pressuresodium (HPS) lamps 10, a particular type of high intensity dischargelamp, which irradiates a plurality of plants 900. The exemplarycontrolled agricultural environment shown in FIG. 1 further includes adehumidifier 65 to manage the relative humidity of the environment andan air conditioner 85, which may include a fan coil, compressor, andcondenser. Energy consumption by the air conditioner 85 generallydepends on (1) the total cooling load of the environment and (2) theenergy efficiency ratio (EER) of the air conditioner 85. The EER of anair conditioner is defined as the ratio of the cooling capacity (inWatts) to the input power (in Watts) at a given operating point. The EERwas calculated with a 35° C. (95° F.) outside temperature and an inside(return air) temperature of 26.7° C. (80° F.) and 50% relative humidity.A higher EER indicates the air conditioner 85 is more efficient.

As shown in FIG. 1 , the HPS lamps 10 may increase the cooling load ofthe environment by (1) dissipating heat convectively and/or radiativelydirectly into the environment and (2) increasing the relative humidityof the environment and thus, the power input and resultant heatgenerated by the dehumidifier 65. The cooling load in this exemplarycontrolled agricultural environment is about 1315 W. For an EER rangingfrom 3 to 7, the input power for the air conditioner thus ranges from450 to 190 W, respectively. Based on the input power to the HPS lamps 10of 1009 W and the dehumidifier 65 of 265 W, the air conditioner 85 thusconsumes about 13% and 26% of the total energy budget, corresponding toan EER of 7 and 3, respectively.

The amount of heat generated may vary depending on the type of lightingsystem used. However, artificial lighting systems for controlledagricultural environments generally have large power inputs (e.g.,greater than 1000 W) in order to sustain a sufficient level ofphotosynthetically active radiation (PAR). Thus, the heat generated byvarious types of lighting systems may still constitute a large portionof heat produced within the environment. In another example, FIG. 2illustrates a conventional controlled agricultural environment where oneor more conventional LED-based lighting fixtures 12A and 12B irradiate aplurality of plants 900. In this exemplary controlled agriculturalenvironment, the LED-based lighting fixtures 12A and 12B dissipates heatprimarily via convection, which may reduce the power input and heatgenerated by the dehumidifier 65. In this example, the total coolingload is about 1210 W. For an EER ratio ranging from 3 to 7, the inputpower for the air conditioner 85 ranges from 405 W to 175 W. Compared tothe first example, the use of LED-based lighting fixtures 12A and 12Bdecreases the total energy budget of the controlled agriculturalenvironment. However, the proportion of energy used by the airconditioner 85 remains similar to the first example at about 13% and 25%for an EER ratio of 7 and 3, respectively. As shown in the two exemplarycontrolled agricultural environments, artificial lighting systems maygenerate a substantial amount of heat, which may result in airconditioning systems consuming a significant portion of the total energybudget in a controlled agricultural environment.

A fluid-cooled LED-based lighting fixture may provide several benefitsto a controlled agricultural environment. As an example, FIG. 3 shows anexemplary implementation of a controlled agricultural environment 2000Awhere a lighting fixture 1000 is retrofit into a pre-existingenvironment that includes a dehumidifier 65 and an air conditioner 85.While not shown explicitly in FIG. 3 , the environment may beconstituted, at least in part, by a building structure to house aplurality of plants 900, one or more lighting fixtures 1000, and otherequipment. The lighting fixture 1000 is cooled by a fluid coolant 800that circulates through a coolant circuit 570. Heat carried by the fluidcoolant 800 is removed by a cooling tower 557 located outside of thecontrolled agricultural environment 2000A. The coolant circuit 570 mayinclude one or more pumps, regulators and/or valves 555 to control theflow of the fluid coolant 800 in the coolant circuit 570.

As shown in FIG. 3 , the one or more pumps, regulators, and/or valves555 may produce a flow of fluid coolant 800 that exhibits a relativelycolder temperature TC upon entry into the lighting fixture 1000 and arelatively hotter temperature TH upon exit from the lighting fixture1000. The rise in temperature of the fluid coolant 800 is due, in part,to convective heating of the fluid as it passes through the lightingfixture 1000 due to heat generated from one or more LED modules withinthe lighting fixture 1000. The fluid coolant 800 may thus be used tocapture and transport heat generated by the lighting fixture 1000, whichmay substantially reduce the cooling load of the environment and thepower inputs to the air conditioner 85 and/or the dehumidifier 65. Asshown in FIG. 3 , the cooling load for the exemplary controlledagricultural environment 2000A is about 635 W, which is approximately50% the cooling load in the exemplary controlled agriculturalenvironments shown in FIGS. 1 and 2 . For an EER ranging from 3 to 7,the input power for the air conditioner thus ranges from 210 W to 90 W,respectively. Based on the input power to the lighting fixture 1000 of1009 W and the dehumidifier 65 of 160 W, the air conditioner 85 thusconsumes about 7% and 15% of the total energy budget, corresponding toan EER of 7 and 3, respectively.

Although a cooling tower 557 is shown in FIG. 3 to facilitateevaporative cooling of the heated fluid coolant exiting the lightingfixture 1000, it should be appreciated that various types of heatrejection devices may be employed in the coolant circuit 570 to removeheat from the fluid coolant 800. Some examples of heat rejection devicesinclude, but are not limited to, various types of evaporative coolers,“free” coolers, chillers, dry coolers, air source coolers, ground sourceheat exchangers, water source heat exchangers, or any combinations ofthe foregoing.

In another example, FIG. 4 shows an exemplary controlled agriculturalenvironment 2000B where a lighting fixture 1000 is coupled to a coolantcircuit 570 that directs the fluid coolant 800 to a hydronics system501A having multiple plumbing subsystems 700A and 700B (also referred toherein as “hydronics loops”), which regulate and/or maintain thetemperature of various portions of the controlled agriculturalenvironment 2000B and/or space near the controlled agriculturalenvironment 2000B (e.g., a hot pool, the growing area) by utilizing thewaste heat generated by the lighting fixture 1000 as a heat source. Thecoolant circuit 570 may receive heat from the lighting fixture 1000 andother environment sources (e.g., a dehumidifier 65, the ambient air)such that excess heat generated in the environment may be substantiallyremoved, thus further improving the energy savings to operate thecontrolled agricultural environment 2000B. In some implementations, thecooling load may be sufficiently reduced so as to eliminate the need forany air conditioning systems (i.e., there is no air conditioner fancoil, compressor or condenser).

As shown in FIG. 4 , the controlled agricultural environment 2000B mayinclude a dehumidifier 65 to regulate the relative humidity of theenvironment. The coolant circuit 570 may direct fluid coolant 800 heatedby the lighting fixture 1000 into the dehumidifier 65 to further removeheat generated by the dehumidifier 65 in a convective manner similar tothe removal of heat from the lighting fixture 1000. The coolant circuit570 may then direct the fluid coolant 800 to the hydronics loops 700Aand 700B, which may be used to heat the plurality of plants 900 and ahot pool, respectively. The coolant circuit 570 may distribute anddirect heated fluid coolant 800 in a controlled manner by one or valves502 before dissipating the remaining heat by the cooling tower 557.

In some implementations, the hydronics system 501A may also be used toregulate the temperature of the ambient environment itself. For example,the hydronics system 501A may be used to heat the controlledagricultural environment 2000B convectively and/or radiatively as thefluid coolant 800 flows through the hydronics system 501A. Furthermore,while FIG. 4 shows a coolant circuit 570 passing through thedehumidifier 65, it should be appreciated that in other implementationsthe coolant circuit 570 need not include the dehumidifier 65, e.g. thecoolant need not flow through the humidifier 65.

An exemplary implementation of a fluid-cooled LED-based lighting fixture1000 is shown in FIG. 5 . The lighting fixture 1000 may include a frame1004 to mechanically support and house various components of thelighting fixture 1000. A light spine 1002 may be incorporated onto oneor more sides of the frame 1004 with features to mechanically couple andsecure the lighting fixture 1000 to a support structure disposed withina controlled agricultural environment. One or more coolant pipes 1006may be coupled to the frame 1004, where each coolant pipe 1006 may beused to flow a fluid coolant 800 to cool the lighting fixture 1000. Oneor more LED modules 400 may be disposed on the frame 1004 to emit PARtowards a plurality of plants. A processor 90 may be coupled to theframe 1004 to facilitate the operation of the lighting fixture 1000including, but not limited to power conversion, network connectivity,and data processing. One or more electrical power ports 1010 may bedisposed on the frame 1004 to supply electrical power to variouscomponents of the lighting fixture 1000, including, but not limited tothe LED modules 400, the processor 90, and other sensors that may becoupled to the lighting fixture 1000. One or more communication ports1009 may be disposed on the frame 1004 to facilitate electricalcommunication and data transmission.

The frame 1004 may be a mechanically rigid, hollow structure that formsa substantially enclosed housing. The interior cavity of the frame 1004may be dimensioned to house a plurality of components in the lightingfixture 1000, such as various electronics in the processor 90. The frame1004 may include one or more mounting features within the interiorcavity to securely couple the plurality components to the frame 1004.For example, the frame 1004 may include one or more slots disposedwithin the interior cavity of the frame 1004 and arranged so as tomechanically support at least two opposing edges of a printed circuitboard. Other mounting features may include, but are not limited tomounting posts and mounting stubs.

One or more removable panels may be included in the frame 1004 toprovide access to the interior space. The one or more removable panelsmay be coupled to a portion of the frame 1004 using various types ofcoupling mechanisms including, but not limited to screw fasteners, boltfasteners, clips, and clamps. In some implementations, the frame 1004may form a sufficiently airtight enclosure or cavity to protectcomponents, e.g., electronics, that may be sensitive to theenvironmental conditions of the controlled agricultural environment. Forexample, the controlled agricultural environment may operate at arelative humidity that may cause moisture to condense onto varioussurfaces of the lighting fixture 1000, causing damage to componentsincluding exposed electronics. In instances where the frame 1004 is anairtight enclosure, moisture may be substantially restricted frominfiltrating the interior space of the frame 1004 to reduce thelikelihood of condensation forming onto components disposed within theframe 1004.

The frame 1004 may also include a recessed portion disposed along atleast one side of the frame 1004, e.g., the bottom side, with sidewallsthat at least partially surround one or more LED modules 400. Therecessed portion may be used to direct light emitted by the one or moreLED modules 400 along a preferred direction and angular distribution.For example, the recessed portion may be used to substantiallyilluminate a growing area containing one or more plants located belowthe frame 1004. In some implementations, the surface quality andorientation of the interior surfaces of the sidewalls forming therecessed portion may form an integrated reflector to reflect lightemitted by the one or more LED modules 400. For example, the interiorsurfaces of the sidewalls may be polished to reflect light in asubstantially specular manner and oriented such that light is reflectedtowards a preferred direction, e.g., the growing area.

The frame 1004 may also include one or more channels formed along one ormore sides of the frame 1004 where each channel may be used to secure acorresponding coolant pipe 1006 to the frame 1004. The cross-sectionalshape of the channel may be substantially similar to the cross-sectionalshape of the coolant pipe 1006 to facilitate insertion of the coolantpipe 1006 into the channel. The coolant pipe 1006 may be secured to thechannel of the frame 1004 using several approaches. For example, thecross-section dimensions of the channel may be equal to or smaller thanthe cross-sectional dimensions of the coolant pipe 1006 to facilitate apress fit where the coolant pipe 1006 is secured to the channel viafriction. In other examples, the coolant pipe 1006 may be clamped to theframe 1004 using one or more clamps, which may include, but are notlimited to zip ties and clamps with a worm drive fastener. The clampsmay be removable to allow replacement of the coolant pipes 1006. Thesurface of the one or more channels may also be polished to improvethermal contact with the coolant pipe 1006, thus enabling greater heatdissipation into the fluid coolant 800. In yet other examples, thecoolant pipes 1006 may be adhered or bonded to the frame 1004 usingvarious methods including, but not limited to adhesive bonding, welding,and brazing. Thermal interface material may also be disposed between thechannel and the coolant pipe to improve thermal contact.

The frame 1004 may also be, at least in part, thermally conducting totransfer heat from the one or more LED modules 400 to the coolant pipe1006. In particular, a first portion of the frame 1004 disposed betweenthe LED module 400 and the coolant pipe 1006 may be formed from athermally conducting material with dimensions to (1) reduce the distancebetween the LED module 400 and the coolant pipe 1006 and (2) increasethe lateral cross-sectional area between the LED module 400 and thecoolant pipe 1006. In this manner, the thermal resistance between theLED module 400 and the coolant pipe 1006 may be reduced. In someimplementations, the frame 1004 may be formed entirely from thethermally conducting material to simplify manufacture and assembly. Insome implementations, the first portion of the frame 1004 may be formedfrom a thermally conducting material while the remainder of the frame1004 is formed from another material, such as a polymer in order toreduce material costs.

The frame 1004 may be formed from various metals, ceramics, polymers, orcomposites including, but not limited to, copper, aluminum, stainlesssteel, carbon steel, polyethylene, acrylic, and porcelain. Depending onthe materials used to form the frame 1004, various method of manufacturemay be utilized including, but not limited to extrusion, sandcasting,milling, injection molding, and manual molding. For instances where theframe 1004 is assembled form multiple parts, various coupling mechanismsmay be used for assembly including, but not limited to snap fits, screwfasteners, bolt fasteners, adhesives, brazing, and welding.

The light spine 1002 may be used to secure the lighting fixture 1000 toa support structure in the controlled agricultural environment. Thesupport structure may be various types of structures including, but notlimited to a railing, a suspended platform, a ceiling, and a wall. Thelight spine 1002 may be a protruding fin formed onto the frame 1004 thatincludes one or more holes of varying size to accommodate differentsizes and types of coupling mechanisms used to secure the lightingfixture 1000 to the support structure. The coupling mechanisms mayinclude, but are not limited to bolt fasteners, screw fasteners, hooks,and shackles. The light spine 1002 may be dimensioned to span the lengthof the frame 1004, thus providing multiple locations along the frame1004 to couple the lighting fixture 1000 to the support structure in astable manner. For example, the light spine 1002 may be disposed on thetop side of the frame 1004 with a length that spans the length of theframe 1004. The light spine 1002 may include a plurality of holes wherethe center axis of each hole is parallel to the top side of the frame1004. Multiple bolt fasteners may be installed at each end and thecenter of the light spine 1002 to secure the lighting fixture 1000 to asidewall of a support structure. Multiple light spines 1002 may also bedistributed along the length of the frame 1004 or on multiple sides ofthe frame 1004 to allow the lighting fixture 1000 to be coupled todifferent support structures.

As described above, the coolant pipe 1006 may be used to flow fluidcoolant 800 to capture heat generated by the LED module 400. The coolantpipe 1006 may be dimensioned to have a length longer than the frame 1004such that a portion of the coolant pipe 1006 may extend beyond the sidesof the frame 1004 to facilitate coupling of the coolant pipe 1006 to apipe from a coolant circuit, a hydronics system, or another lightingfixture 1000. Various types of coupling mechanisms may be used to couplethe coolant pipe 1006 to another pipe including, but not limited tothreaded fittings, where the ends of the coolant pipe 1006 havecorresponding threads, and bolt fasteners, where the end of the coolantpipe 1006 have a flange that mates to a corresponding flange on anotherpipe. In a preferred implementation, push-to-connect plumbing fittingsmay be used as a coupling mechanism where the ends of the coolant pipe1006 are left bare. In this manner, internal seals and O-rings do notneed to be used.

Multiple coolant pipes 1006 may be incorporated into the frame 1004where each coolant pipe 1006 may be used to flow fluid coolant 800 alongthe same or opposing directions. For example, the lighting fixture 1000may include two coolant pipes 1006 disposed on opposing sides of theframe 1004. For a lighting fixture 1000 that supports multiple LEDmodules 400, an opposing flow configuration (e.g., fluid coolant 800flows in opposing directions between the two coolant pipes 1006) maymore uniformly remove heat from the multiple LED modules 400. Incomparison, a same flow configuration will result in more heat removedfrom the LED module 400 closest to the fluid coolant 800 input and lessheat removed from the LED module 400 furthest from the fluid coolant 800input. Additionally, the opposing flow configuration may more readilyfacilitate implementation of a closed coolant circuit. For example, thetwo coolant pipes 1006 may be connected at one end by a plumbing fittingsuch that fluid coolant 800 entering the lighting fixture 1000 flowsthrough a first coolant pipe 1006 and then a second coolant pipe 1006serially before exiting the lighting fixture 1000 on the same side.

The coolant pipe 1006 may be formed from various materials includingcopper, aluminum, and stainless steel. In a preferred implementation,the coolant pipes 1006 may be formed from copper to reduce algae growth,fouling, and corrosion. Thus, by coupling copper coolant pipes 1006using the push-to-connect plumbing fittings described above, the fluidcoolant 800 may pass through a coolant circuit made up of only copperwithout contacting other materials in the lighting fixture (e.g., analuminum frame 1004).

The cross-sectional dimensions of the coolant pipe 1006 may varydepending on multiple factors including, but not limited to a desiredflow rate, fluid coolant properties (e.g., dynamic viscosity, density),and a desired type of flow. For example, it may be desirable for thefluid coolant to be in a turbulent flow regime, which engenders a higherheat transfer coefficient, thus dissipating more heat from the lightingfixture 1000. In some implementations, the cross-sectional dimensions ofthe coolant pipe 1006 may be chosen such that a particular Reynold'snumber, Re, is greater than a desired threshold (e.g., Re>4000 forturbulent flow) for a given pump power and coolant circuit geometry. Theinterior surface of the coolant pipe 1006 may also be roughened toincrease the surface area and the convective heat transfer coefficient.The effective depth and pitch of the interior surface roughness may bechosen so as to not substantially increase pumping requirements (e.g.,due to a larger pressure drop) and maintains wettability of the interiorsurface to the fluid coolant 800 (e.g., remains hydrophilic,oleophilic).

The fluid coolant 800 used to capture and carry heat from the lightingfixture 1000 may be chosen based on several factors. First, it ispreferable for the fluid coolant 800 to exhibit a high thermalconductivity and a high specific heat in order to increase heatdissipation from the LED module 400 to the fluid coolant 800. Second,the fluid coolant 800 should remain in a liquid phase within theoperating temperature and pressure range of the controlled agriculturalenvironment. For example, the fluid coolant 800 should not freeze orboil as it passes through the lighting fixture 1000, the coolantcircuit, the hydronics system, or a cooling tower. Third, the fluidcoolant 800 should also be chosen so as not to substantially corrode thecoolant pipe 1006. For controlled agricultural environments, the fluidcoolant 800 may be various fluids including, but not limited to water,mineral oil, glycol, and mixtures.

The lighting fixture 1000 also may include one or more communicationand/or auxiliary power ports, for example, to provide auxiliary DC powerto one or more auxiliary devices coupled to the port(s), and/orfacilitate communications between the lighting fixture and the one ormore auxiliary devices. Example of such ports include, but are notlimited to, one or more Power over Ethernet (PoE) ports and/or one ormore Universal Serial Bus (USB) ports.

For example, the lighting fixture 1000 may include at least oneelectrical power port 1010 to supply electrical power to variouscomponents in the lighting fixture 1000 (e.g., the LED module 400)and/or various components electrically coupled to the lighting fixture1000 (e.g., other lighting fixtures 1000 or auxiliary sensors). Theelectrical power port 1010 may receive as input alternating current (AC)power, such as from a building electrical supply system, which may beconverted into direct current (DC) power via the processor 90. Theprocessor 90 may include electronics to facilitate conversion between DCand AC power, as will be discussed in greater detail below.

One or more communication ports 1009 may also be used in the lightingfixture 1000 to facilitate data transmission to and from the lightingfixture 1000. For example, the communication port 1009 may be used toremotely control various aspects of the lighting fixture 1000 including,but not limited to adjustments to electrical power (e.g., high voltageand low voltage modes), adjustments to the spectral content of the lightemission (e.g., directing more power to blue or red LED elements), andcommands to operate auxiliary sensor devices (e.g., frequency of datarecording). In another example, the communication port 1009 may be usedto send various status and monitoring data to a remote user including,but not limited to electrical power consumption, temperature, and datameasured by auxiliary sensor devices. The data received and transmittedby the communication port 1009 may be managed, in part, by the processor90, as will be discussed in more detail below.

The communication port 1009 may accommodate various types of electricalcabling including, but not limited to universal serial bus (USB) cablesand Power over Ethernet (PoE) cables. In some implementations, multiplecommunication ports 1009 including both USB and PoE ports may be used toenable greater flexibility and compatibility with more types of cablingand auxiliary devices. One or more communication ports 1009 may bedisposed on one or more sides of the frame 1004. For example, a set ofcommunication ports 1009 may be disposed on opposite sides of the frame1004 (e.g., left and right sides or front and rear sides) to facilitateconnectivity between a plurality of lighting fixtures 1000 in adaisy-chain configuration. Communication ports 1009 may also be disposedon the frame 1004 where auxiliary sensors are likely to be deployed. Forexample, communication ports 1009 may be disposed on the bottom side ofthe frame 1004 to provide electrical connection to auxiliary sensorsthat are used to monitor ambient conditions near the plants locatedbelow the lighting fixture 1000. In some implementations, thecommunication port 1009 may also supply DC power. For example, thelighting fixture 1000 may include a USB port that may electrically poweran auxiliary sensor device and receive data measured by the auxiliarysensor device through the same communication port 1009.

The LED module 400 may include one or more LED elements arranged into anarray. The one or more LED elements of the LED module 400 may each emitlight at a particular wavelength such that in combination, the LEDmodule 400 irradiates plants with light at multiple wavelengths tailoredto improve various aspects related to the growth of plants and operationof the controlled agricultural environment including, but not limited toimproving photosynthetic rates of the plants, growth modification, andultraviolet (UV) sterilization. The one or more LED elements may beassembled onto the frontside of a printed circuit board. An exemplarycircuit layout of an LED module 400 according to one inventiveimplementation is shown in FIGS. 6A and 6B, which illustrates therespective halves 400A1 and 400A2 of the LED module 400A. As shown, theLED module 400A may include multiple LED elements that are distributedacross the printed circuit board.

The printed circuit board may be a metal core printed circuit board(MCPCB) to facilitate heat dissipation generated by the one or more LEDelements. The LED module 400 may be coupled to the frame 1004 such thatthe backside of the printed circuit board is in contact with the bottomside of the frame 1004 located in the recessed portion as describedabove. The LED module 400 may be coupled to the frame 1004 using variouscoupling mechanisms including, but not limited to screw fasteners, boltfasteners, clips, and clamps. The coupling mechanism may be adjustedsuch that a clamping force is applied to the LED module 400, thusimproving the thermal contact between the LED module 400 and the frame1004. Additionally, thermal interface material may also be placedbetween the LED module 400 and the frame 1004 to improve thermalcontact.

In some implementations, the lighting fixture 1000 may also include anoptic located on the recessed portion of the frame 1004, which coversthe LED module 400. The optic may be used to modify the direction andangular distribution of the light emitted by the LED module 400. Forexample, a portion of the optic may have a convex surface to focus lightemitted from the LED module 400 onto plants located directly below thelighting fixture 1000. The optic may be coupled to the frame 1004 usingvarious coupling mechanisms including, but not limited to screwfasteners, bolt fasteners, clips, and clamps. In some implementations,the optic may form a substantially airtight enclosure around the LEDmodule 400, thus substantially isolating the LED module 400 from theambient environment in the controlled agricultural environment. Similarto the airtight enclosure that may be formed by the frame 1004, theoptic may reduce moisture infiltration, thus reducing the risk ofcondensation damaging the LED module 400.

An exemplary lighting fixture 1000 according to one inventiveimplementation is shown in FIGS. 7A-7C. FIG. 7A shows a bottomperspective view of the lighting fixture 1000 and FIG. 7B shows a front,bottom, left and right side view of the lighting fixture 1000. As shown,the lighting fixture 1000 includes a frame 1004 dimensioned to supportthree LED modules 400A, 400B, and 400C positioned in a row and disposedon the bottom side of the frame 1004. A light spine 1002 may be formedon the top of the frame 1004 that substantially spans the entire lengthof the frame 1004. The light spine 1002 may include a plurality ofdifferent sized holes to facilitate coupling of the lighting fixture1000 to a support structure in the controlled agricultural environment.The left and right-side panels of the frame 1004 may be secured by aplurality of screw fasteners and hence, may be removed to allow accessinto the interior cavity of the frame 1004. The left side panel of theframe 1004 may include two communication ports 1009, e.g., a USB port1012A and a PoE port 1008C. The right-side panel of the frame 1004 mayalso include two communication ports 1009, e.g., two PoE ports 1008A and1008B, as well as an electrical power port 1010. Two communicationports, e.g., a USB port 1012B and a PoE port 1008D, may be disposed onthe bottom side of the frame 1004 to facilitate connectivity toauxiliary senor devices that may be used to monitor ambient conditionsnear the plants. The lighting fixture 1000 also includes two coolantpipes 1006A and 1006B disposed along the front and rear sides of theframe 1004. The frame 1004 may be formed from an aluminum extrusion toinclude a corresponding pair of channels. The coolant pipes 1006A and1006B, which may be formed form copper, may be press-fit or crush-fitinto the corresponding channels. In this manner, the likelihood thatfluid coolant flowing through the coolant pipes 1006A and 1006B contactsthe frame 1004 is substantially reduced.

FIG. 7C shows a cross-sectional view of the lighting fixture 1000 wherethe coolant pipes 1006A and 1006B are shown to be press-fit into thechannels of the frame 1004. Thermal interface material 1007 may bedisposed between the channels and the coolant pipes 1006A and 1006B toimprove thermal contact. The LED modules 400A-400C are disposedsubstantially in a recessed portion of the bottom side of the frame 1004and in close proximity to the coolant pipes 1006A and 1006B tofacilitate heat dissipation. As shown, a small portion of the frame1004, which is formed from a thermally conducting material, is presentbetween the coolant pipes 1006A and 1006B and the LED modules 400A-400C.FIG. 7C also shows mounting features 1014 used to support variouscontrol circuitry boards 100, 200, and 300, which are collectivelyreferred to hereafter as a processor 90. The mounting features 1014 area pair of protruding slots disposed along the front and rear sides ofthe frame 1004, which are dimensioned to support the opposing edges ofthe processor 90. The processor 90 is positioned above the coolant pipes1006A and 1006B and LED modules 400A-400C in order to reduce thermaleffects due to heat generated by the LED modules 400A-400C. An optic1020 is also included, which may be coupled to the frame 1004 via aplurality of screw fasteners. The optic 1020 may be a transparent lenswith a convex surface used to redirect light emitted by the LED modules400A-400C along a desired direction and angular distribution. The optic1020 may also substantially enclose and isolate the LED modules400A-400C from the surrounding ambient environment.

As described above, the lighting fixture 1000 may be coupled to otherlighting fixtures 1000 in a daisy-chain configuration where electricaland piping connections are shared to facilitate assembly of a continuouselectrical circuit and coolant circuit. For the coolant circuit, thedaisy-chain configuration may be in series where the fluid coolant 800exiting from one lighting fixture 1000 flows into a subsequent lightingfixture 1000 within the daisy-chain. The temperature of the fluidcoolant 800 may increase further due to heat generated from the LEDmodules 400 of the subsequent lighting fixture 1000. It should beappreciated that so long as the temperature of the coolant fluid 800 isless than the temperature of the LED modules 400 in the lighting fixture1000, the fluid coolant 800 may still capture heat from the lightingfixture 1000. Furthermore, in some implementations, heat rejectiondevices may be interspersed along the coolant circuit to reduce thetemperature of the fluid coolant 800 and maintain sufficient heatdissipation as the fluid coolant 800 passes through multiple lightingfixtures 1000. An exemplary implementation detailing the manner in whichtwo lighting fixtures 1000 and 1000-B may be coupled in a daisy-chainconfiguration is shown in FIG. 8A. In some implementations, the lightingfixture 1000 may be coupled to a support structure 999 using a boltfastener 1027 placed through a hole in the light spine 1002 and securedto the side of the support structure 999 as shown in FIG. 8A.

The coolant pipes 1006A and 1006B of the lighting fixture 1000 may becoupled to a corresponding set of coolant pipes 1006A-B and 1006B-B fromthe other lighting fixture 1000-B using one or more intermediate pipes.As shown in FIG. 8A, the pair of coolant pipes 1006B and 1006B-B (1006Aand 1006A-B) may be connected via a single intermediate pipe 1040B(1040A). Each intermediate pipe 1040B (1040A) may have push-to-connectfittings 1025A (1025B) disposed on both ends to facilitate connection tothe coolant pipes 1006B and 1006B-B (1006A and 1006A-B). The shape ofthe intermediate pipe may vary depending on the desired distance andorientation between lighting fixtures 1000 and 1000-B. For example, thelength of the intermediate pipe may be longer in order to space thelighting fixtures 1000 and 1000-B further apart to provide greater arealcoverage or to traverse a gap separating two separate growing areas. Inanother example, the intermediate pipe may be curved such that thelighting fixtures 1000 and 1000-B are oriented at an angle relative toone another, e.g., 90 degrees, to accommodate variable shaped growingareas. In yet another example, the intermediate pipe may besubstantially U-shaped to couple two parallel rows of lighting fixtures1000 where the lighting fixtures 1000 and 1000-B are the last lightingfixtures 1000 in each respective row. In this manner, the coolantcircuit may be continuous for multiple rows of lighting fixtures 1000.

Electrical power may be supplied to multiple lighting fixtures 1000through a single power cable. An exemplary power cable 1030 coupled tothe lighting fixture 1000 is shown in FIG. 8A. In some implementations,the power cable 1030 may be rated to support a particular electricalpower and current input. For example, the power cable 1030 may be ratedto supply at least 1000 W of electrical power and up to 15 A of current.Depending on the power and current requirements of the lighting fixture1000, the power cable 1030 may be used to power multiple lightingfixtures 1000, thus reducing the amount of cabling and the number ofelectrical terminals (e.g., electrical outlets) that need to beinstalled in the controlled agricultural environment.

The lighting fixture 1000 may also be communicatively coupled to anotherlighting fixture 1000 to facilitate transmission of data and controlsignals to multiple lighting fixtures 1000. As shown in FIG. 8A, anEthernet cable 1060 may be used to couple the PoE port 1008A of lightingfixture 1000 to the PoE port 1008C-B of lighting fixture 1000-B. Each ofthe lighting fixtures 1000 and 1000-B may include a processor to managethe flow of data and/or control signals. In some implementations, thelighting fixture 1000 may be used as a piggyback to facilitate thetransfer of data and/or control signals to another lighting fixture 1000located further along the daisy-chain. In this manner, multiple lightingfixtures 1000 spanning a large area may be communicatively coupled to afewer number of network nodes (e.g., hubs, switches, routers) andwithout using excessive amounts of network cabling.

An exemplary arrangement of lighting fixtures 1000 in a controlledagricultural environment 2000 is shown in FIG. 8B. Multiple lightingfixtures 1000 may be arranged along a row spanning a growing areadefined by the dimensions of a shelf 902A. Each lighting fixture 1000 inthe row may be coupled to a support structure 999A disposed above theshelf 902A. The lighting fixtures 1000 in the row may be coupledtogether in a daisy chain configuration, as described above.Intermediate piping may be used to couple adjacent lighting fixtures1000 such that fluid coolant 800 may circulate through the multiplelighting fixtures 1000 in a continuous manner from a single inlet andoutlet for the row. One or more power cables may be used to supplyelectrical power to the lighting fixtures 1000. Ethernet cabling may beused to communicatively couple the lighting fixtures 1000 in a serialmanner and to a common network node. As shown in FIG. 8B, the controlledagricultural environment 2000 may include multiple rows of lightingfixtures 1000 supported by support structures 999A-999E arranged abovecorresponding rows of shelves 902A-902E. The controlled agriculturalenvironment 2000 may further include a fan 75, dehumidifiers 65A and65B, and air conditioning ducts 85A and 85B for one or more airconditioners.

As previously shown in the exemplary controlled agriculturalenvironments 2000A and 2000B in FIGS. 3 and 4 , respectively, thelighting fixture 1000 may be incorporated into a coolant circuit 570 tofacilitate the flow of fluid coolant 800 such that heat may becontinuously removed from the lighting fixture 1000. In someimplementations, the coolant circuit 570 may be designed tosubstantially remove heat from only the lighting fixture 1000 and is notintended to thermally interact with other components or regions of thecontrolled agricultural environment 2000A, as shown in the coolantcircuit 570 in FIG. 3 for a retrofit application. In someimplementations, however, the coolant circuit 570 may include additionalpiping subsystems designed to redistribute heat to a space near orwithin the controlled agricultural environment, such as the & hydronicsloops 700A and 700B shown in FIG. 4 for a hydronics application, and/orto store heat captured by the lighting fixture 1000 for later use.

A piping subsystem may be branched from the coolant circuit 570 suchthat the flow of fluid coolant 800 may be controllably adjusted (e.g.,by a valve and a separate pump) without affecting the flow of fluidcoolant 800 through the coolant circuit 570 and hence, without affectingthe removal of heat from the lighting fixture 1000. However, in someinstances, a piping subsystem may be placed in series with the coolantcircuit 570 where the piping subsystem is also used on a continualbasis. Some exemplary instances of a piping subsystem being used inseries with the coolant circuit 570 includes, but is not limited to aheating system for a hot water system in a residential space, storingheat from the fluid coolant 800 in a thermal energy storage system, andcharging a battery by converting heat from the fluid coolant 800 intoelectricity (e.g., using a thermoelectric device).

In some example implementations, particularly in connection with powercabling code compliance, the lighting fixture 1000 may be considered asan industrial horticultural lamp and a component of an “industrialmachine” (rather than a general lighting fixture). For purposes of thepresent disclosure, an “industrial machine” is a power-driven machine,not portable by hand while working, that is used to process material bycutting; forming; pressure; electrical, thermal, or optical techniques;lamination; or a combination of these processes. The associatedelectrical equipment, including the logic controller(s) and associatedsoftware or logic together with the machine actuators and sensors, areconsidered as part of the industrial machine (the foregoing definitionis consistent with that provided in chapter 3, section 3.3.54 of theU.S. National Fire Protection Association (NFPA) 79 Electrical Standardfor Industrial Machinery). As such, the lighting fixture 1000 may beequipped with and used with industrial type connectors and industrialcable systems.

For example, industrial power cables and connectors may be employed in alighting system comprising multiple lighting fixtures 1000, wherein theindustrial cables and connectors are multi-point interconnection powercable assemblies for industrial machinery according to the UnderwritersLaboratory (UL®) product category PVVA and compliant with the UL®standard 2237. According to UL® PVVA, multi-point interconnection powercable assemblies are intended for use in an industrial environment todistribute power to branch circuits, including motor branch circuits, ofindustrial machinery. The assemblies may consist of power cableassemblies, male and female power cable fittings, panel-mounted powercable/conductor fittings and feeder-tap power cable fittings used withindustrial machinery in accordance with ANSI/NFPA 79, ElectricalStandard for Industrial Machinery.

The PVVA UL Product Spec UL 2237 states that devices covered under thisstandard are only intended for indoor use, unless otherwise identified.Devices covered under this standard are rated 1,000 V or less. Eachdevice is rated in volts and amperes. The electrical ratings are marked,on each device or on a flag label affixed to each individual power cableassembly. The cable assembly fittings are intended to be assembled ormolded on flexible cord. The power cable assemblies and mating fittingsare not intended to be used as a substitute for the fixed wiring of thebuilding or structure. The power cable assemblies and mating fittingsmay be connected to the fixed wiring of the building or structure; usinga feeder tap fitting or male/female cable fitting. Power cableassemblies and fittings covered under this standard are not intended tomake or interrupt current under load conditions. These power cableassemblies and fittings have been investigated to their markedshort-circuit current rating. Power cable assemblies and fittings mayspecify a maximum ampere rating, type of overcurrent protective device,or both. Unless otherwise marked, the power cable assemblies andfittings are intended to be supplied from an overcurrent protectivedevice of the maximum ampere rating permitted by the RelationshipBetween Conductor Size and Maximum Rating or Setting of Short-CircuitProtective Device for Power Circuits Table, Table 7.2.10.4, of theNational Fire Protection Association Electrical Standard for IndustrialMachinery, NFPA 79, reproduced below:

TABLE 7.2.10.4 Relationship Between Conductor Size and Maximum Rating orSetting of Short-Circuit Protective Device for Power Circuits MaximumRating Non-Time-Delay Fuse Time Delay Conductor or Inverse Time or DualSize Circuit Breaker Element Fuse (AWG) (amperes) (amperes) 14 60 30 1280 40 10 100 50 8 150 80 6 200 100 4 250 125 3 300 150 2 350 175 1 400200 0 500 250 2/0 600 300 3/0 700 350 4/0 800 400

It is acceptable under UL 2237 and NFPA 79 to specify a 40 A circuitbreaker for a continuous 30 A load in mixed 10 AWG and 14 AWGassemblies. For assemblies containing only 14AWG a 20 A circuit breakermay be used for a continuous 15 A load.

FIG. 8C shows one exemplary assembly of cabling used to electricallypower multiple lighting fixtures. As shown, the assembly may include adrop tee cable 1110 coupled to two power cables 1120 (1120A and 1120B inFIG. 8C). The power cables 1120 may be used, in part, as extensioncables to extend cabling to lighting fixtures 1000 located at a greaterdistance from a power source. The drop tee cables 1110 may be used togenerate branches in the cabling to distribute power to multiplelighting fixtures 1000. For example, the exemplary cabling assemblyshown in FIG. 8C may be connected to an electrical power supply systemvia the power cable 1120A at the port 1122A, the power cable 1120B maybe connected to one lighting fixture 1000 via the port 1124B, and thedrop tee cable 110 may be connected to another lighting fixture 1000 viathe port 1112. It should be appreciated that the cabling assembly inFIG. 8C is one example and that multiple drop tee cables 1110 and powercables 1120 may be coupled together to provide power to multiplelighting fixtures 1000. In some implementations, the assembly may belimited, in part, by the power rating of each cable and/or the amount ofpower that should be supplied to each lighting fixture 1000.

FIGS. 8D-8G show several views of the drop tee cable 1110. As shown, thedrop tee cable 1110 may include two female ports 1112 and 1114 and onemale port 1116. Each port may be designed in accordance to a standardsize and/or connector type. For example, the ports shown in FIGS. 8D-8Gcorrespond to a ⅞ inches threaded connector (male and female). Thethreaded connector may further be a Unified National 16 pitch (16 UN)threaded connector. The size and type of ports used may depend, in part,on the electrical power port 1110 on the lighting fixture 1000 (e.g., a⅞ inches AC or DC power port). The length of the respective cabling forthe port 1112 may also vary based on typical distances betweenneighboring lighting fixtures 1000. The drop tee cable 1110 may also berated to support a current up to 15 A. The drop tee cable 1110 may alsobe designed to be multi-point interconnection power cables forindustrial machinery according to the Underwriters Laboratory (UL®)product category PVVA and compliant with the UL® standard 2237. The droptee cable 1110 may include three electrical pins (e.g., a positiveterminal, a negative terminal, and/or ground). For example, FIGS.8H-1-8H-3 shows an exemplary wiring diagram of how the pins at each portin the drop tee cable 1110 are electrically coupled to one another.

FIGS. 8I-8L show several views of the power cable 1120. As shown, thepower cable 1120 may include a male port 1124 and a female port 1122.Similar to the drop tee cable 1110, the ports of the power cable 1120may also conform to a standard size and connector type, such as a ⅞inches threaded connector (male and female) where the threaded connectoris a Unified National 16 pitch (16 UN) threaded connector. The powercable 1120 may also be rated to support a current up to 15 A. The powercable 1120 may also be designed to be multi-point interconnection powercables for industrial machinery according to the Underwriters Laboratory(UL®) product category PVVA and compliant with the UL® standard 2237.The power cable 1120 may also include three electrical pins (e.g., apositive terminal, a negative terminal, and/or ground). FIG. 8M shows anexemplary wiring diagram describing how the pins of the ports 1122 and1124 are connected.

FIGS. 8N-8P shows several views of a network cable 1130 used tocommunicatively couple multiple lighting fixtures 1000 to one anothervia the PoE ports 1008A and/or 1008B on the lighting fixture 1000. Thelighting fixture 1000 may also be used as a platform to providecommunication (e.g., data transfer, control) between multiple lightingfixtures 1000 and the sensors that may be coupled to each lightingfixture 1000, thus simplifying the manner in which a plurality oflighting fixtures 1000 and sensors are communicatively coupled. In someimplementations, the network cable 1130 may be an Ethernet cable, asdepicted in FIGS. 8N-8P though it should be appreciated other connectortypes may be used in other implementations. In some implementations, thenetwork cable 1130 may be waterproof (e.g., a waterproof Ethernet cable)to provide a longer lifetime use, particularly in an agriculturalenvironment with potentially high ambient moisture content. One examplesof an Ethernet cable is a Cat-5 cable, as well as other categories ofEthernet cables (e.g., Cat-5e, Cat-6, Cat-7).

FIGS. 8Q-1-8Q-5 shows additional designs for the drop tee cable 1110 andthe power cable 1120. Additionally, FIG. 8Q-1 also shows an outlet 1140that supports connectivity to the drop tee cable 1110 and/or the powercable 1120. The outlet 1140 may be integrated into the power source tofacilitate connectivity. FIG. 8R shows an exemplary lighting fixture1000 where a power cable 1120 is connected to the power port 1010 and anetwork cable 1130 is connected to the PoE port 1008B.

FIG. 9A shows an exemplary hydronics system 501 that may be used inconnection with a coolant circuit 570 as well as in otherimplementations of a controlled agricultural environment where one ormore lighting fixtures 1000 are used. As shown, the hydronics system 501may include a fluid storage tank 500 to store fluid coolant 800, whichmay be disposed internally or externally to the controlled agriculturalenvironment. In some implementations, the fluid storage tank 500 mayinclude separate compartments for relatively cooler fluid coolant 800and relatively hotter fluid coolant 800 with sufficient thermalinsulation to substantially thermally isolate the compartments from oneanother and the surrounding environment. The fluid storage tank 500 mayalso be dimensioned to have a sufficiently large storage capacity suchthat the thermal time constant of the fluid storage tank 500 meets adesired rate of change in temperature during operation. For example, itmay be desirable for the temperature of the fluid coolant 800 stored inthe fluid storage tank 500 to remain substantially unchanged (e.g., 1°C. per hour) throughout the day to reduce fluctuations in the amount ofheat supplied to various piping subsystems. However, if adjustments tothe fluid coolant 800 temperature are desired, the amount of time neededfor the adjustments to occur may be prohibitive due to the long thermaltime constant. In such instances, multiple fluid storage tanks 500, eachhaving a smaller capacity and thus a shorter thermal time constant, maybe used instead.

Three submersible pumps 560A, 560B, and 560C may be disposed within thefluid storage tank 500 to pump fluid coolant 800 through threecorresponding piping subsystems, namely, the coolant circuit 570 (alsoreferred to in FIG. 9A as a “lighting loop”), a heating loop 512, and acooling loop 514. The lighting loop 570 associated with the pump 560A isresponsible for providing relatively cooler fluid coolant from the fluidstorage tank 500 to one or more lighting fixtures 1000 (e.g., via thecoolant circuit 570 as shown in FIGS. 3 and 4 ) and returning relativelyhotter fluid coolant 800 from the one or more lighting fixtures 1000 tothe fluid storage tank 500. In this manner, the lighting loop 570 mayfunction as a heat source to heat fluid coolant 800 stored in the fluidstorage tank 500 with heat being subsequently distributed to otherpiping subsystems. In some implementations, the lighting loop 570 may beused to heat at least a portion of the controlled agriculturalenvironment 2000C via natural convection or thermal radiation toregulate and maintain temperature of the portion within a desiredtemperature envelope.

In some implementations, a secondary heating loop may be incorporatedinto the lighting loop 570 to more directly and controllably heat aportion of the controlled agricultural environment 2000C that may not beproximate to the lighting loop 570 (e.g., a growing area, as shown inFIG. 4 ). For example, the secondary heating loop may include a pump, afan, and a fan coil. The pump may generate a flow of relatively hotterfluid coolant 800 through the fan coil, thus heating the fan coil. Thefan may then generate a flow of hot air, thus heating the portion of thecontrolled agricultural environment 2000C via forced convection. Inanother example, the secondary heating loop may be routed through theroot zone of the growing area to heat the soil or nutrient solution to adesired temperature via a combination of convection and conduction(e.g., see the hydronics loop 700A in FIG. 4 ). The secondary heatingloop may include a flow controlling device (e.g., a valve) to controlthe amount of heat added to the portion of the controlled agriculturalenvironment. For example, the secondary heating loop may be coupled to athermostat that adjusts the heat added according to a day/night cycle

The heating loop 512 associated with the pump 560B may also be used toheat a portion of the controlled agricultural environment 2000C oranother space located separately to the controlled agriculturalenvironment 2000C. For example, the heating loop 512 may be coupled to aheating, ventilation, and air conditioning (HVAC) system in a buildingto regulate the interior climate of the building, a heating system in amanufacturing plant to offset gas or electricity consumption, or acogeneration plant to produce electricity and high-grade heat. In someimplementations, the heating loop 512 may also be coupled to a heatstore 530, which may provide additional capacity to store heat forfuture use by the controlled agricultural environment 2000C or anotherspace.

The cooling loop 514 associated with the pump 560C may be used to coolthe fluid coolant 800 stored in the fluid storage tank 500. In thismanner, the temperature of the relatively cooler fluid coolant 800entering the lighting loop 570 may be regulated and maintained, whichmay reduce the effects of thermal drift over time where the temperatureof the relatively cooler fluid coolant 800 increases, thus reducing theamount of heat removed from the one or more lighting fixtures 1000. Insome implementations, the cooling loop 514 may be a piping subsystemthat captures heat to an exterior environment via natural convection andradiation along the length of the cooling loop 514. In someimplementations, a heat rejection device may be incorporated into thecooling loop 514 to facilitate cooling of the fluid coolant 800. Varioustypes of heat rejection devices may be used including, but not limitedto cooling towers (e.g., see the cooling tower 557 in FIG. 3 or FIG. 4), evaporative coolers, “free” coolers, chillers, dry coolers, airsource coolers, ground source heat exchangers, water source heatexchangers, or any combinations of the foregoing. In someimplementations, the cooling loop 514 may also be coupled to a coldstore 520, which may provide additional capacity to store relativelycooler fluid coolant 800 for future use by the controlled agriculturalenvironment 2000C or another space.

In various implementations described herein, the temperature of thefluid coolant 800 stored in the fluid storage tank 500 and flowingthrough the lighting loop 570, heating loop 512, cooling loop 514, andone or more secondary loops coupled to any of the lighting loop 570,heating loop 512, cooling loop 514 may vary within an appreciabletemperature range. In some implementations, the temperature of the fluidcoolant 800 may range from about 20° C. to about 50° C. The flow rate ofthe fluid coolant 800 may range from about 1 gallon per minute to about3 gallons per minute through the lighting loop 570. Similar orsignificantly different (e.g., higher) flow rates may be used by theheating loop 512 and the cooling loop 514. Furthermore, the variouspiping subsystems (e.g., the lighting loop 570, the heating loop 512,and the coolant loop 514) may be controlled via at least one of a pump,regulator, and/or valves. The at least one of a pump, regulator, and/orvalves may be operated on various time cycles (e.g., daily, weekly,monthly, seasonal, other periodicities, or any combination thereof) toregulate and maintain desired thermal conditions, which may be dynamicas a function of time, in the controlled agricultural environment 2000C.

Additionally, while three piping subsystems are shown in FIG. 9A, itshould be appreciated that any number and combination of pipingsubsystems may be used with the coolant circuit 570. For example, one orboth of the heating loop 512 and the cooling loop 514 may be used inconjunction with the lighting loop 570. It should also be appreciatedthat while three submersible pumps 560A-560C are shown in FIG. 9A, anynumber of pumps may be used for a particular piping subsystem and thepumps 560A-560C may also be disposed externally to the fluid storagetank 500. The pumps may be various types of pumps including, but notlimited to piston pumps, end-suction pumps, diaphragm pumps, gear pumps,lobed pumps, flexible-vane pumps, nutating pumps, peristaltic pumps,centrifugal pumps, diffuser pumps, propeller pumps, and peripheralpumps.

An exemplary implementation of a hydronics system 501B coupled to alighting fixture 1000 and a coolant circuit (“lighting loop”) 570 in acontrolled agricultural environment 2000D is shown in FIG. 9B. Thehydronics system 501B may include a fluid storage tank 500 havingcontained therein a submersible pump 560. The submersible pump 560 isused to pump relatively cooler fluid coolant 800 into a lighting loop570, where the fluid coolant 800 is then heated as it passes through thelighting fixture 1000. Subsequently, the relatively hotter fluid coolant800 exits the lighting loop 570 and enters the fluid storage tank 500for storage. It should be appreciated that so long as the temperature ofthe fluid coolant 800 stored in the fluid storage tank 500 is less thanthe temperature of the fluid coolant 800 entering the fluid storage tank500 from the lighting loop 570, heat generated by the lighting fixture1000 may be removed. Over time, if the temperature of the fluid coolant800 increases, the amount of heat that may be removed may decrease dueto a smaller temperature difference. Thus, a heat rejection device mayneed to be incorporated into the hydronics system 501B to regulate thetemperature of the fluid coolant 800 stored in the fluid storage tank500.

The hydronics system 501B shown in FIG. 9B may also include a secondaryheating loop 700C coupled to the portion of the lighting loop 570 whererelatively hotter fluid coolant 800 heated by the lighting fixture 1000flows through (e.g., similar to the hydronics loops 700A and 700B shownin FIG. 4 ). As shown, the secondary heating loop 700C may include apump 704 and an electric fan with a fan coil 702. The pump 704 generatesa flow of the relatively hotter fluid coolant 800 through the fan coil,thus heating the fan coil. The electric fan 702 may then blow heated airtowards a plurality of plants 900 located below the lighting fixture1000 to increase the temperature of the growing area as desired. Thesecond heating loop 700C may be controlled using one or morecontrollable valves to toggle the secondary heating loop 700C and toadjust the temperature of the air blown by the electric fan 702.

Another exemplary implementation of a hydronics system 501C disposed ina controlled agricultural environment 2000E is shown in FIG. 9C. Asshown, the controlled agricultural environment 2000E may have avertically-stacked multiple-level growing area. Each level of thegrowing area may include one or more lighting fixtures 1000 coupled to alighting loop 570. The lighting loop 570 may be coupled to a fluidstorage tank 500, which may again contain therein a submersible pump.Similar to the controlled agricultural environment 2000D of FIG. 9B, thehydronics system 501C may include secondary heating loops to separatelyheat each growing area in each level. The portions of the lighting loop570 corresponding to each level may be coupled using a plumbing fittingwith multiple inlets and outlets. Additionally, the portion of thelighting loop 570 coupled to the fluid storage tank 500 may support ahigher flow rate to account for a reduction in flow rate once the fluidcoolant 800 flows into each respective level of the growing area.

In some implementations, the lighting fixture 1000 may also function asa sensor platform supporting one or more sensors used to monitorenvironmental conditions in the controlled agricultural environment. Theprocessor 90 in the lighting fixture 1000 may supply and regulateelectrical power to the sensor through the communication ports 1009(e.g., a USB port and a PoE port). The processor 90 may also includeelectronics to convert AC power to DC power, as will be described below,thus obviating the need for a separate AC to DC converter in each sensordeployed in the controlled agricultural environment. The processor 90may also be used to manage data communications, including sendingcontrol signals to the sensor and receiving sensory data measured by thesensor for processing and/or transmission to a remote device (e.g., aremote computer or server). In this manner, the lighting fixture 1000may provide integration of one or more sensors of various types,supplementing the need for separate power and data communicationssystems. Furthermore, the data measured by the one or more sensors maybe used to adjust and control operation of one or more lighting fixtures1000 (e.g., adjusting the PAR output from the lighting fixture 1000),one or more coolant circuits or other fluid coolant loops (e.g.,adjusting the fluid flow through the coolant circuit/lighting loop,heating loop, and cooling loops shown in FIG. 9A), one or more fans, oneor more dehumidifiers, or one or more air conditioners in the controlledagricultural environment. In some implementations, various environmentalconditions are measured and controlled to provide target vapor pressuredeficits in the environment.

An exemplary implementation of a controlled agricultural environment2000 detailing the integration of various sensors via multiple lightingfixtures 1000 is shown in FIG. 10A. Similar to FIG. 8B, multiplelighting fixtures 1000 may be mounted to a support structure 999disposed above a plurality of plants 900 arranged on a shelf 902. Thecontrolled agricultural environment 2000 may include one or moredehumidifiers 65, one or more air conditioners 85, and one or more fans75. A variety of sensors may be supported by the lighting fixture 1000including, but not limited to an air temperature sensor 80A, a nearinfrared (NIR) leaf moisture sensor 80B, a relative humidity sensor 80C,a hyperspectral camera 80D, a carbon dioxide sensor 80E, an infrared(IR) leaf temperature sensor 80F, an airflow sensor 80G, and a root zonetemperature sensor 80H. The hyperspectral camera 80D refers to a type ofcamera that measures light within numerous energy bands (e.g., hundreds)where each band is narrower (e.g., 10 nm) than conventional imagingsystems. Finite spectral cameras (also referred to as multispectralcameras) may also be used in the controlled agricultural environment2000 to measure light using a fewer number of energy bands (e.g. 3 to10) where each band is broader (e.g., greater than 20 nm). The camerasutilized in the controlled agricultural environment 2000 may measurelight across various portions of the electromagnetic spectrum including,but not limited to ultraviolet, visible, near-infrared, mid-infrared,and far-infrared wavelengths. The lighting fixture 1000 may also be usedto support other auxiliary devices including, but not limited to one ormore fans, security cameras, smart phones, and multi-spectral cameras(e.g., to analyze soil moisture and nutrient content). In this manner,various auxiliary devices may be distributed in the controlledagricultural environment due to the flexible placement of communicationports 1009 on the respective lighting fixtures 1000.

FIGS. 10B-10G show multiple exemplary lighting systems that incorporatea varying number of lighting fixtures 1000 joined together in terms ofelectrical power transfer, networking, and plumbing. Specifically, FIGS.10B and 10C show a lighting system with a single lighting fixture 1000.As shown, a single power cable 1120, network cable 1130, andintermediate piping 1040 for each coolant pipe 1006 may be used tocouple the lighting fixture 1000 for operation. FIGS. 10D and 10E showanother lighting system that uses two lighting fixtures 1000. As shown,an assembly of power cabling (e.g., the two power cables 1120 and thedrop tee cable 1110 in FIG. 8C) may be used to supply power to the twolighting fixtures 1000. Additionally, a network cable 1130 may be coupleone lighting fixture 1000 to the other lighting fixture 1000 tocommunicatively couple the lighting fixtures 1000 to a common node.Additionally, intermediate pipes 1140 may be used to join the twolighting fixtures 1000 via the plumbing fittings 1025A and 1025B. FIGS.10F and 10G show another lighting system that uses three lightingfixtures 1000. As shown, the power cabling may include an additionaldrop tee cable 1110 and power cable 1120 compared to FIGS. 10D and 10E.Additional network cable 1130 and intermediate pipes 1040 may be used toconnect the additional lighting fixture 1000.

It should be appreciated this approach of assembling multiple lightingfixtures 1000 may be used to build lighting systems that include evenmore lighting fixtures 1000 (e.g., tens of lighting fixtures 1000,hundreds of lighting fixtures 1000). The extent to which the number oflighting fixtures 1000 may be coupled in this manner may depend onexternal factors such as the pumps used to drive coolant through thecoolant pipes 1006 (e.g., a longer coolant circuit exhibits a greaterpressure drop and hence a higher pumping specification to sufficientlyflow coolant through the coolant circuit) and/or the power that shouldbe supplied to each lighting fixtures 1000 (e.g., the cabling rating ofup to 15 A may limit how many lighting fixtures 1000 are poweredsimultaneously).

Regarding fluid coolant flowing through the pipes of respective lightingfixtures 1000, as noted above the fluid coolant prevents heat generatedby the lighting fixture from entering the controlled agriculturalenvironment and keeps the lighting fixture at reasonable operatingtemperatures. In some implementations, the temperature of the fluidcoolant flowing through the lighting fixtures is above the dew pointwithin the controlled agricultural environment (e.g., to preventcondensation on the lighting fixture), and below 120° F. (or 48° C.) atthe last fixture through which the fluid coolant flows in a fluidcoolant circuit. In one aspect, the LED light sources of each lightingfixture generally operate about 15° F. (or 7° C.) higher than thetemperature of the fluid coolant flowing through the fixture. In someimplementations, a recommended temperature for the fluid coolant isapproximately 100-110° F.

Regarding the pipes 1006A and 1006B of a given lighting fixture, fluidcoolant may flow in either direction through each pipe, and bothparallel and U-shaped end return configurations are acceptable. Whenrespective pipes of multiple lighting fixtures are connected in seriesto form a coolant circuit, in some implementations a fluid flow rate ofbetween 0.33 gallons per minute (GPM) to 0.5 GPM per light isacceptable; in one aspect, at least 0.5 GPM per pipe ensures sufficientturbulence. In one aspect, higher flow rates allow for smaller drycoolers and cooling towers.

The maximum flow rate per pipe is set by the tubing wear limit. TheCopper Development Association's Copper Tube Handbook recommends maximumwater velocities of between 5 and 8 feet per second for “Hot” and “Cold”water, respectively. For lighting fixtures 1000 in which the pipes 1006Aand 1006B are ½ inch copper tubing, the flow velocity is 1.37 ft/s perGPM. Hence the recommended range of maximum flow rates is between 3.6and 5.8 GPM per tube.

The temperature rise in the fluid coolant circuit can be estimated fromthe heat produced per lighting fixture (e.g., 600 W), the flow rate, andN the number of lights:

${\Delta T_{{^\circ}{F.}}} = {\frac{600W}{147*GPM} \cdot N}$ or${\Delta T_{{^\circ}{C.}}} = {\frac{600W}{{70} - {LPM}} \cdot N}$

In one aspect, there is virtually no change in the amount of heatcaptured in the fluid coolant circuit as the temperature of a lightingfixture changes. The internal temperatures of lighting fixtures increaseand decrease proportionally to the cooling loop temperature.

When choosing between a U-return configuration and a parallel flowdesign for the pipes 1006A and 1006B of multiple lighting fixtures of alighting system, in some implementations the parallel flow setup isrequired over approximately 4 GPM, since higher flow rates will causetubing degradation, as all of the flow is confined to the one tube.

In one example lighting system installation, the fluid coolant is waterpumped from a small reservoir by a pump to a set of piping connectingthe pipes of multiple lighting fixtures 1000 such that the water flowsthrough all of the pipes 1006A and 1006B to a radiator placed outside ofthe controlled agricultural environment and finally back to the smallreservoir. Such a system may be used in applications in which re-use ofthe heat absorbed by the water is not desired, impractical, etc. Thesystems design in this case involves selecting the dry cooler, and thenchoosing a suitable pump to achieve the water flow needed.

For a system of six lighting fixtures and a flow rate of 3 GPM (i.e.,0.5 GPM per light), the temperature rise across the series of lights isapproximately 8 degrees. A U-return configuration may be employed forthe fluid coolant circuit (as 3 GPM is below the wear limit which beginsabove 4 GPM). The minimum dry cooler must then be capable of a capacityof 3600 W of rejection at the maximum expected outside temperature, themaximum recommended water inlet temperature (e.g., 120 degrees F.), and3 GPM. Once a suitable dry cooler is selected, its known water flowcharacteristics as well as those of the plumbing can be used to properlysize the pump to achieve 3 GPM.

Additional components such as air separators, an expansion tank, andprovisions for filling and draining the system are also needed, as withany hydronics system. A thermostat on the dry cooler inlet can operatethe fan. Setting this at approximately 100 degrees F. to 120 degrees F.will generally achieve good thermal regulation. Multiple dry coolers canbe placed in various configurations to expand capacity as is common. Asnoted above, it is important not to reduce the water temperature belowthe dewpoint in the room, to prevent condensation. In very cold climatesit may be necessary to install a temperature controlled bypass valve tobypass the radiator completely to achieve this. Glycol may also beneeded.

Returning now to the functionality of the lighting fixture 1000, theprocessor 90 may be used to facilitate multiple functionalitiespertinent to the operation of the lighting fixture 1000 including, butnot limited to power conversion, network connectivity, and dataprocessing in the operation of the lighting fixture 1000. In someimplementations, the processor 90 may be comprised of discreteelectronics assemblies that are electrically coupled together where eachelectronics assembly provides one or more distinct functionalities. Forexample, FIG. 11A shows a block diagram detailing various electroniccomponents and circuitry in the processor 90 to meet thesefunctionalities according to one inventive implementation. The processor90 may include a control board 100, a network board 200, and a singleboard computer 300.

The control board 100 may be used to regulate and distribute electricalpower to other components of the lighting fixture 1000. As shown in FIG.11A, the control board 100 may receive AC power through an electricalpower port 1010 and convert the AC power to DC power. The control board100 may then supply DC power and other control signals to otherelectronics in the lighting fixture 400. For example, the control board100 may be directly coupled to multiple LED modules 400A, 400B, and 400Cvia ports/connectors 104A, 104B, and 104C, respectively, on the controlboard 100. The control board 100 may also be coupled to the networkboard 200, providing both electrical power and control signals to thenetwork board 200. The control board 100 may also include onboardmemory, in which digital signal processing (DSP) firmware 152 is storedto facilitate generation of control signals as described below.

A more detailed block diagram of the control board 100 in FIG. 11A isshown in FIG. 11B. The control board 100 may include afuse/electromagnetic interference (EMI) filter 153 to provide safety andreduce noise input into the lighting fixture 1000. A rectifier 154 maybe used to convert AC power to DC power. An AC line sensor 155 may beused to monitor the voltage and current of the DC power input. DC powermay then be passed directly to a bias and control power supply 156,which may be used to distribute DC power to other components of thelighting fixture 1000 including the network board 200 and a digitalsignal processor (DSP) 150. A DC-DC converter 158 may also be includedto supply different voltage inputs to the network board 200. Forexample, the bias and control power supply 156 may supply 48 V and 5 Vto power different circuitry on the network board 200 and the singleboard computer 300. The 5 V input may be down converted from the 48 Vline via the DC-DC converter 158. The DSP 150 may provide controlsignals by executing the firmware 152 described above to variouscomponents including the network board 200, via one or morecommunications isolators 160. The DSP 150 may also provide controlsignals to one or more boost converters 162A, 162B, and 162C, which maybe used to regulate electricity supplied to the corresponding LEDmodules 400A-400C via ports 104A-104C. The boost converters 162A-162Cmay receive DC power directly once converted from AC power via therectifier 154. The DSP 150 may receive power from the bias and controlpower supply 156, a voltage and current measurement from the AC linesensor 155, and thermal sensor inputs via the thermal sensor ports 154,which may be used to monitor the temperature of the LED modules400A-400C.

The network board 200 may be used to manage data communication betweenthe lighting fixture 1000 and various devices coupled to the lightingfixture 1000 including, but not limited to other lighting fixtures 1000and one or more auxiliary sensors coupled to the lighting fixture 1000.As shown in FIG. 11A, in some implementations, the network board 200 maycontrol one or more PoE ports 1008A, 1008B, 1008C, and 1008D of thelighting fixture 1000. The network board 200 may receive electricalpower and control signals from the control board 100 via a control boardport 102. The network board 200 may also supply electrical power andcontrol signals to the single board computer 300 via a single boardcomputer port 202. The network board 200 may also support a dedicatedEthernet cable connection 212 through an Ethernet port 213 between thenetwork board 200 and the single board computer 300 to manage datatransfer through the PoE ports 1008A-1008D.

A more detailed block diagram of the network board 200 in FIG. 11A isshown in FIG. 11C. The control board port 102 may be used to supplyelectrical power at different voltages, e.g., 48 V and 5 V, to a PoEcontroller 206, a power supply 208, and a fan controller and port 210.The control board port 102 may also directly relay control signals fromthe control board 100 to the single board computer 300 via the singleboard computer port 202. In some implementations, the control board port102 may be arranged as a piggyback board to the network board 200. ThePoE controller 206 may be used to regulate and supply electrical powerto the PoE ports 1008A-1008D. The power supply 208 may supply electricalpower to the single board computer 300, through the single boardcomputer port 202, and to an Ethernet switch 204. The Ethernet switch204 is communicatively coupled to the PoE ports 1008A-1008D and to thesingle board computer 300 via the Ethernet port 213, which supports thededicated Ethernet cable connection 212. The Ethernet switch 204 may beused to facilitate receipt and transmission of data and/or controlsignals to and from the PoE ports 1008A-1008D.

The single board computer 300 may provide several functions to theprocessor 90 including, but not limited to managing the operation of thecontrol board 100 and the network board 200 and data processing. Asshown in FIG. 11A, the single board computer 300 may also be used tosupport the functionality of USB ports 1012A and 1012B on the lightingfixture 1000. The single board computer 300 may include a memory card350 that contains (has stored thereon) various data and computerexecutable code 352 including, but not limited to, session bordercontroller (SBC) software, an operating system, web server software andother web server assets.

The processor 90 may be used to manage the voltage and current suppliedto various components of the lighting fixture 1000, e.g., a power cable,the LED modules 400A-400C, in order to reduce the likelihood of damageunder different operating conditions. For example, the lighting fixture1000 may be operated under low voltage conditions where 1200 W may besupplied to the LED modules 400A-400C and 65 W for auxiliary sensors.The power cable used to supply electricity to the lighting fixture 1000from an external source, e.g., a building electrical supply system, maybe rated to sustain a current up to 15 A. The processor 90 may be usedto limit the current through the lighting fixture 1000 to 5 A such thatthree lighting fixtures 400A-400C may be powered by a single power cable1030. If the current draw of the lighting fixture 1000 approaches 5 A,the processor 90 may reduce the power draw of the lighting fixture. Inthis manner, the three lighting fixtures 400A-400C may collectivelyavoid a total current draw that exceeds 15 A, thus reducing thelikelihood of damaging the power cable.

In some implementations, the processor 90 may enforce a current drawlimit using an active feedback control loop. For instance, the DSP 150of the control board 100 may be used to actively measure the voltage andcurrent supplied to the lighting fixture 1000 via the AC line sensor155. Depending on the magnitude and/or rate of change of the measuredvoltage and current, the DSP 150 may then adjust the voltage and currentsupplied to each of the LED modules 400A-400C such that the currentdrawn by the lighting fixture 1000 is maintained below the current drawlimit. This process may be conducted in an iterative manner wheremeasurements of the voltage and current supplied to the lighting fixture1000 and subsequent adjustments to the voltage and current supplied tothe LED modules 400A-400C repeatedly occur at a preset timescale. Thetimescale may vary from about 1 ms to about 60 s. The amount the voltageand current are varied during each increment may also vary according tothe rate of change of the voltage and current supplied to the lightingfixture 1000. In some implementations, the stability of the activefeedback control loop may be controlled by incorporating a proportionalintegral differential (PID) controller into the processor 90.

FIGS. 12A-12D, 13, 14A-14H show circuit diagrams of various electricalcomponents of a processor 90 according to one implementation. FIG. 12Ashows a circuit diagram of an Ethernet switch 204 from a network board200 and the electrical connections to PoE ports 1008A-1008D and anEthernet port 213 for communication to a single board computer 300. FIG.12A also shows a circuit diagram of a power supply 208 from the networkboard 200. For visual clarity, FIGS. 12B and 12C show expanded views ofthe Ethernet switch 204 and the PoE port 1008D from FIG. 12A,respectively. FIG. 12D shows a circuit diagram of a PoE controller 206from the network board 200. FIG. 13 shows a circuit diagram of a singleboard computer 300 detailing various input and output connections. FIG.14A shows circuit diagrams for an electrical power port 1010, fuse/EMIfilter 153, a rectifier 154, and a first portion of a bias and controlpower supply 156 from a control board 100. FIG. 14B shows a secondportion of the bias and control power supply 156 shown in FIG. 14A.FIGS. 14C-14F show a DC-DC converter 158, an AC line sensor 155, a DSP150, and thermal sensor ports 154 from the control board 100. FIGS. 14Gand 14H show circuit diagrams of an exemplary boost circuit 162A fromthe control board 100.

The lighting fixture 1000 disclosed herein may also be utilized in aleased lighting system where a customer pays a recurring fee to rent andoperate the lighting fixture 1000 (e.g., provide lighting using thelighting fixture 1000). In this system, the costs typically associatedwith purchasing the lighting fixture 1000 hardware and installation maybe substantially reduced, thus providing substantial savings to thecustomer. The manufacturer providing the operation of the lightingfixture 1000 may earn a profit over time through continuing payments bythe customer. In some implementations, the leased lighting system may bebased on payment of a fee to operate the lighting fixture 1000 for apreset period of time. The lighting fixture 1000 may be communicativelycoupled to a server via the processor 90. The server may remotelyregulate operation of the lighting fixture, enabling the lightingfixture 1000 to provide lighting so long as the customer providesnecessary payment to maintain the lease.

An exemplary implementation of a contract enforcement method where thelighting fixture 1000 is communicatively coupled to a license server 600is shown in FIG. 15A. As shown, the license server 600 may include adatabase 602 containing information including, but not limited to aserial number for one or more lighting fixtures 1000 installed by acustomer and a customer status (e.g., a payment status) for the customerto which the one or more lighting fixtures 1000 are leased. The databasemay also include a pre-shared key 604, which is also installed onto eachlighting fixture 1000, e.g., such as in protected internal storage ofthe DSP 150 of the lighting fixture 1000, by the manufacturer, togetherwith a timer, prior to shipment to the customer. Upon initial payment bythe customer, the manufacturer may setup an initial timer update in thedatabase 1000 to provide for some time period for initial lighting,after which an additional lease payment is required. Once the lightingfixture 1000 is deployed to the customer, the expiration of the timermay trigger a license update process. Once the additional lease paymentis made, the manufacturer operating the license server 600 may updatethe database 602 with a new timer value, which is communicated to thelighting fixture 1000. Communication may occur via a proprietarycommunication protocol.

An exemplary implementation of a process to update a license for aleased lighting model with one or more lighting fixtures 1000 is shownin FIG. 15B. In this exemplary process, the DSP 150 and the single boardcomputer 300 of the processor 90 may be coupled to the license server600 and database 602 via the Internet to facilitate operation by themanufacturer of the one or more lighting fixtures 1000 or a leasingagent. As described above, the pre-shared key 604 and license timer maybe stored in the protected internal storage of the DSP 150 by themanufacturer together with the serial number of the lighting fixture1000. The single board computer 300 may periodically check the status ofthe license timer. Once the license timer is near expiration, the singleboard computer 300 may initiate with the DSP 150 a license updaterequest. This request may include a “challenge packet” generated by theDSP 150, which is forwarded by the single board computer 300 to thelicense server 600. The challenge packet may include encryptedinformation based, at least in part, on the serial number of thelighting fixture 1000 and a temporary random key generated using a noiseaccumulator. The challenge packet may then be decrypted by the licenseserver 600. If the challenge packet is found to be valid and payment ismade for additional lighting, the license server 600 may then determinea new allowed timer value. The new allowed timer value may then beencrypted and sent back to the single board computer 300, which passesthe encrypted timer value to the DSP 150. The DSP 150 may then decryptthe new timer value based on the pre-shared key 604. If the new timervalue is found to be valid, the DSP 150 may update the license timerstored in the protected internal storage of the DSP 150.

An Exemplary Integrated Sensor Assembly

Based on the various concepts described above and illustrated in theaccompanying drawings, various inventive implementations of anintegrated sensor assembly for CEA systems will now be described. Asdescribed in the foregoing, sensors can be deployed in a controlledagricultural environment to monitor environmental conditions and toprovide feedback to lighting, heating and/or cooling (e.g., viahydronics and/or other techniques), air flow, and humidity conditioningsystems to facilitate control of growth conditions for plants. In someimplementations, the sensors can be packaged as a single integratedassembly that utilizes a single port to receive electrical power andcommunicate data. In this manner, multiple sensing modalities can beadded to CEA systems to augment monitoring of environmental conditionsto improve the growth conditions of plants while simplifyinginstallation and reducing maintenance. Furthermore, multiple integratedsensor assemblies can be deployed to cover larger areas of theagricultural environment to also monitor variations in growth conditionsacross the agricultural environment.

An exemplary implementation of an integrated sensor assembly 3100 isshown in FIGS. 16A and 16B. The assembly 3100 includes multiple sensorsto monitor various parameters relevant to the growth of plants, such asa visible light sensor 3110, a combined temperature and relativehumidity sensor 3120, an air flow sensor 3130, a CO2 sensor 3140, and anIR temperature sensor 3150. The sensors can be mounted on a circuitboard 3160, which can also include a USB port 3170 to provide electricalpower and communication between the integrated sensor assembly 3100 andan external power and control system (e.g., a lighting fixture 1000 asdescribed above). A housing 3180 can be used to protect the sensors andcircuitry disposed on the circuit board 3160. As shown in FIG. 16C, thecircuit board 3160 can be positioned inside a cavity defined by ahousing top 3181 and a housing bottom 3182, which are assembled using aplurality of coupling members 3190. In some implementations, the housingtop 3181 can include an open aperture 3183, as shown in FIG. 16D, whichcan be covered by a lens 3184 to allow light to transmit through thehousing for detection by the visible light sensor 3110 while protectingthe sensors and circuitry contained within the housing.

The visible light sensor 3110 can be used to monitor light emitted bynatural or artificial light sources, e.g., sunlight or LED lighting,incident on plants in the agricultural environment. In particular, thevisible light sensor 3110 can be configured to measure thephotosynthetic photon flux density (PPFD), which is a measure of photonflux per unit area integrated over a wavelength spectrum. The visiblelight sensor 3110 can be various suitable types of light detectorsincluding, but not limited to, photodiodes, thermopiles, andpyroelectric detectors. In some implementations, the visible lightsensor 3110 can be configured to be spectrally sensitive to PAR light inthe visible spectrum and ultraviolet radiation, e.g., UVA and UVBranges, using filters, coatings, or different materials for detection.In other implementations, the visible light sensor 3110 can beconfigured to be a spectrometer to characterize the spectral componentsof the light source. As shown in FIG. 16E, the visible light sensor 3110can be positioned near the top of the integrated sensor assembly 3100and oriented to face a light source for detection. The visible lightsensor 3110 can also be configured to detect light across a range ofviewing angles, e.g., from normal incidence at 0 degrees to obliqueincidence up to 80 degrees, as shown in FIG. 16F, in cases where thelight source can illuminate plants at different angles of incidence,e.g., variations in sunlight during the day. Two examples of a lightsensor 3110 is given by a Vishay VEML6075 and VEML7700.

The combined temperature and relative humidity sensor 3120 can be usedto monitor the temperature and water vapor concentration in the growingenvironment. The temperature sensing element in the combined temperatureand relative humidity sensor 3120 can be various suitable types oftemperature sensors including, but not limited to, a thermocouple, athermistor, and a resistance temperature detector (RTD). The relativehumidity sensing element can be various suitable types of humiditysensor including, but not limited to, capacitive, resistive, or thermalsensors. Examples of a combined temperature and relative humidity sensor3120 are given by a Texas Instruments HDC1010YPAR and a Sensiron SHT31.As shown in FIG. 16D, the combined temperature and relative humiditysensor 3120 can be positioned on a protruding member of the circuitboard 3160 such that the sensing elements are exposed to air surroundingthe integrated sensor assembly 3100. In some implementations, thehousing near the combined temperature and relative humidity sensor 3120and other sensing elements in the integrated sensor assembly 3100 can beconfigured such that measurements of the temperature and relativehumidity are not significantly influenced by the integrated sensorassembly 3100. For example, the housing can include a plurality ofopenings to facilitate air flow and the combined temperature andrelative humidity sensor 3120 can be positioned relatively far from heatsources near the integrated sensor assembly 3100, e.g., heat dissipatedby a lighting fixture.

The air flow sensor 3130 can monitor air circulation, which can provideinsight to the directionality of air flow, uniformity of temperature,detection of leaks, and the performance of air flow and ventilationsystems deployed in the agricultural environment. The air flow sensor3130 can be various suitable types of air flow sensors including, butnot limited to, air flow meters, hot wire anemometers, and sonicanemometers. One example of an air flow sensor 3130 is given by a TDKThermistor 470 NTC 0402 with accompanying resistors, capacitors, andoperational amplifiers. As shown in FIG. 16D, the air flow sensor 3130can be positioned on a protruding member of the circuit board 3160 suchthat the sensor is exposed to air surrounding the integrated sensorassembly 3100. In some implementations, the housing near the air flowsensor 3130 and other sensing elements in the integrated sensor assembly3100 can be configured to reduce disruptions in air flow near the airflow sensor 3130 to enable more accurate measurements of air flow. Forexample, the housing can include a plurality of openings to allow air tofreely flow across the air flow sensor 3130.

In agricultural environments, the concentration of CO2 is an importantparameter governing the growth of plants since plants absorb CO2 duringphotosynthesis. Furthermore, the photosynthetic activity of plants canvary throughout the day; hence, the amount of absorbed CO2 can also varyaccordingly. The CO2 sensor 3140 can thus be used to monitor theconcentration of CO2 near the plants in the agricultural environment.The CO2 sensor 3140 can be various suitable types of CO2 sensorsincluding, but not limited to, non-dispersive infrared (NDIR) sensorsand chemical CO2 sensors. One example of a CO2 sensor 3140 is given by aWinsensor MH-Z19. In some implementations, the CO2 sensor 3140 can be anenclosed device electrically coupled to the circuit board 3160 foroperation, as shown in FIG. 16C. Furthermore, the CO2 sensor 3140 can bepositioned on the bottom of the integrated sensor assembly 3100 suchthat the sensing elements of the CO2 sensor 3140 are oriented towardsthe plants. Such configurations can be preferable to increase air flowacross the CO2 sensor 3140 since convective currents near the plants candrive air upwards towards the bottom of the integrated sensor assembly3100. In some implementations, the CO2 sensor 3140 can further protrudethrough the housing bottom 3182 to reduce obstructions to air flow andthus provide more accurate measurements of CO2 concentrations.

As described above, the combined temperature and relative humiditysensor 3120 can monitor the air temperature near the plants, which is animportant parameter governing plant growth. In addition, it is alsoinstructive to monitor the surface temperature of the plants, as thesurface temperature of the plants may differ due to irradiation by lightand convective heat transfer from the plant to the surrounding air. TheIR temperature sensor 3150 can thus be used to remotely monitor thetemperature of plants near the integrated sensor assembly 3100 bymeasuring IR radiation emitted from the plants. In some implementations,the IR temperature sensor 3150 can be a single pixel sensor thatmeasures an average temperature within a particular field of view. Inother implementations, the IR temperature sensor 3150 can be amulti-pixel camera capable of recording IR images to discern temperaturegradients within a single plant or between neighboring plants. The IRtemperature sensor 3150 can be various suitable types of IR sensorsincluding, but not limited to, pyroelectric detectors and bolometers.Furthermore, the IR temperature sensor 3150 can be configured to bespectrally sensitive to long wavelength infrared (LWIR) radiation,mid-infrared (MIR) radiation, or near-infrared (NIR) radiation. In someimplementations, the IR temperature sensor 3150 can be configured to bea spectrometer, e.g., a Fourier transform infrared (FTIR) spectrometer,to characterize the spectral components of the radiation emitted by theplants. The IR temperature sensor 3150 can be configured to have a widefield of view to cover a larger area of plants. For implementationswhere the IR temperature sensor 3150 is a multi-pixel camera, the IRtemperature sensor 3150 can also be configured to record images atsufficient spatial resolution to discern the temperature of individualleaves on a plant. One example of an IR temperature sensor 3150 is givenby Melexis MLX90614.

The circuit board 3160 can include one or more printed circuit boardssupporting circuitry and electrical components used in the operation ofthe respective sensor components discussed above. One inventiveimplementation of the circuitry supported by the circuit board 3160 isshown in FIGS. 17A and 17B. In some implementations, the circuit board3160 can include multiple single sided circuit boards for sensorspositioned on the top and the bottom of the integrated sensor assembly3100, respectively. In other implementations, the circuit board 3160 canbe a double sided circuit board. In some implementations, the circuitboard 3160 can also include open ports for additional sensors, as shownin FIGS. 17A and 17B. Some examples of additional sensors can includegas sensors configured to detect pollutants in the air, pH sensors tomonitor soil quality, and a hyperspectral camera.

As described above, the housing 3180 may be used to protect the sensorsand circuitry disposed on the circuit board 3160 contained within thecavity defined by the housing 3180. In some implementations, the housing3180 may be a two piece construction with a housing top 3181 and ahousing bottom 3182 that forms an interior cavity where the circuitboard 3160 can be positioned. The housing top 3181 and the housingbottom 3182 may be mated together with coupling members 3190, as shownin FIGS. 16C and 16D. The coupling members 3190 can be various suitabletypes of coupling components including, but not limited to, screwfasteners, clips, pins, snap-fits, and pegs with corresponding holes inthe housing 3180. The housing 3180 can include one or more openings andapertures to allow various sensors to detect surrounding environmentalconditions without significant obstruction. For example, the housing top3181 can have a relatively large opening 3183 to allow passage of lightat relatively large oblique angles of incidence for detection by thevisible light sensor 3110. To ensure the visible light sensor 3110 andthe circuit board 3160 are protected, a transparent lens 3184 can becoupled to the top of the housing top 3181, as shown in FIG. 16C. Thelens can be made of material transparent to PAR light or UV radiation,such as polytetrafluoroethylene (PTFE), silica, magnesium fluoride, orcalcium fluoride.

The housing 3180 may also include one or more protruding portions inboth the housing top 3181 and the housing bottom 3182 to support and/orhouse the various connectors and sensors in the integrated sensorassembly 3100. As an example, FIGS. 16C and 16D show the housing top3181 may include a first top protruding portion 3187A and the housingbottom 3182 may include a first bottom protruding portion 3187B thatcouple to one another to form a first protruding portion that partiallysurrounds the USB port 3170. The housing top 3181 may also include asecond top protruding portion 3185A and the housing bottom 3182 maysimilarly include a second bottom protruding portion 3185B to form asecond protruding portion on an opposite side of the housing 3180 fromthe first protruding portion with a cavity that contains therein the airflow sensor 3130. The housing top 3181 may also include a third topprotruding portion 3186A and the housing bottom 3182 may also include athird bottom protruding portion 3186B to form a third protruding portionadjacent to the second protruding portion with a cavity that containstherein the combined temperature and relative humidity sensor 3120.

In some implementations, the housing 3180 can also be configured to bewater tight or air tight to reduce potential failures caused by moistureaccumulation in electronic components or circuitry. To ensure the cavityof the housing 3180 is tightly sealed, gaskets can be used to seal eachopening or aperture in the housing 3180, particularly openings wheresensors protrude from the housing 3180 to expose the sensors to airsurrounding the integrated assembly 3100. The housing 3180 can be formedfrom metals, polymers, metal alloys, ceramics, and/or other materials.Depending on the materials used to form the housing 3180, variousmanufacturing methods can be used to fabricate the housing 3180including injection molding, blow molding, casting, or milling. In someimplementations, the housing can be coated with materials to reducemoisture infiltration, e.g., hydrophobic coatings, to increase theoperating lifetime of the integrated sensor assembly 3100.

In some implementations, the integrated sensor assembly 3100 can alsoinclude a USB port 3170 to facilitate connection to an external system,such as a LED-based lighting fixture 1000 as described above. The USBport 3170 can both supply electrical power to the integrated sensorassembly 3100 and facilitate data communication between the integratedsensor assembly 3100 and a control system operably coupled to theexternal system, e.g., the lighting fixture 1000. In someimplementations, the integrated sensor assembly 3100 can be configuredto be a “plug and play” device for ease of installation. For example,the integrated sensor assembly 3100 can be plugged into a LED-basedlighting fixture, wherein the integrated sensor assembly 3100 isautomatically recognized by the control system for the LED-basedlighting fixture. Once the integrated sensor assembly 3100 isidentified, the control system can begin receiving data recorded by theintegrated sensor assembly 3100, which can then be processed and used ina feedback loop to adjust one or more of lighting, heating and/orcooling (e.g., via hydronics and/or other techniques), air flow, andhumidity conditioning systems in the agricultural environment.

FIG. 18 illustrates an integrated sensor assembly coupled to a downwardor bottom USB port 1012B of the lighting fixture 1000 shown in FIGS. 7Aand 7B via one or more USB couplers/extenders, according to someimplementations of the disclosure. In one implementation, the USB port3170 of the sensor assembly 3100 may be plugged directly into thelighting fixture USB port 1012B. In other implementations, it may bedesirable to position the sensor assembly 3100 essentially on the samelevel or proximate to a downward face of the lighting fixture 1000, butgenerally out of the path of illumination provided by the lightingfixture 1000. To this end, one or more “gooseneck-type” flexible USBextenders 3202, and/or one or more adjustable-angle USB extenders 3204,may be employed to communicatively couple and adjustably position thesensor assembly 3100 to the lighting fixture 1000. While agooseneck-type and an adjustable angle-type USB extender are shown inFIG. 18 , it should be appreciated that various other types of USBextenders, including cables, may be employed alone or together withother types of USB extenders to couple the sensor assembly to thelighting fixture 1000.

To this end, FIG. 19 illustrates an integrated sensor assembly 3100coupled to a side or end USB port 1012A of the lighting fixture 1000shown in FIGS. 7A and 7B via one or more cable-type USBcouplers/extenders, according to some implementations of the disclosure.In FIG. 19 , the sensor assembly may be coupled to one end of a USBcable extender 3206, and the other end of the cable extender 3206 may becoupled to the USB port 1012A of the lighting fixture. Various lengthsof cable extenders may be employed for the extender 3206 so as toposition the sensor assembly 3100 at different distances below thelighting fixture 1000. The cable extender 3206 may be used alone, ortogether with one or more other cable extenders, one or moregooseneck-type extenders 3202, one or more adjustable angle-typeextenders 3204, one or more other types of extenders, or combinations ofthe foregoing. As noted above in connection with FIG. 18 , differentlengths of cable extenders 3206 may be employed to couple the sensorassembly 3100 to the downward or bottom USB port 1012B as well;likewise, one or both of the gooseneck-type extender 3202, theadjustable angle-type extender 3204, or yet another type of USBextender, without a cable-type extended 3206, may be employed to couplethe sensor assembly 3100 to the side or end USB port 1012A of thelighting fixture 1000.

In some implementations, once the integrated sensor assembly 3100interfaces with an external system, the external system can control howfrequently measurements are taken by each sensor in the integratedsensor assembly 3100. Sensor measurements can be recorded simultaneouslyor at different time intervals. For example, the integrated sensorassembly 3100 can be configured to measure the air flow every second,the PPFD every minute, and the CO2 concentration every hour.

In some implementations, multiple integrated sensor assemblies 3100 canbe installed as an array to monitor larger areas of the controlledagricultural environment. For example, controlled agriculturalenvironments can include multiple LED-based lighting fixtures where eachlighting fixture supports multiple integrated sensor assemblies 3100.Each integrated sensor assembly 3100 in the array can be used to locallymonitor growth conditions for a single or small group of plants, asdescribed above in connection with FIG. 10A. Additionally, analysis ofsensor data from multiple integrated sensor assemblies 3100 can be usedto determine variations in growth conditions, such as temperature, airflow, or lighting, across an entire agricultural environment. Based onthis aggregate data, adjustments can be made to one or more of thelighting, heating and/or cooling (e.g., via hydronics and/or othertechniques), air flow, and humidity conditioning systems to fosterimproved growth conditions over larger areas in the agriculturalenvironment. In some implementations, each integrated sensor assembly3100 can include an identification number, e.g., vendor identification(VID) or product identification (PID), which can be used to determinethe location of each sensor assembly in the array.

Distributed Sensor Grid

Based on the various concepts described above and illustrated in theaccompanying drawings, various inventive implementations of adistributed sensor grid for a controlled agriculture environment willnow be described. A controlled agricultural environment can include oneor more control systems, including, but not limited to, lighting,heating, air flow, hydronics, and humidity conditioning systems,configured to work in concert with one or more sensors, e.g.,temperature, relative humidity, air flow, soil quality, the integratedassembly 3100 described above. The sensors can measure variousenvironmental conditions in an agricultural environment, and data fromthe sensors can then be used to adjust one or more control systems toimprove or maintain growth conditions for plants.

The Inventors have recognized and appreciated that conventionalcontrolled agricultural environments may have appreciably large growingareas for multiple plants or crops over which growing conditions mayvary as a function of space and/or time. In particular, growingconditions in a given environment (for relatively larger or smallergrowing areas alike) may significantly differ in one or more respects indifferent portions of a given growing area at different times (e.g.,amongst different rows or groupings of plants, as well as at differentelevations in the environment). Inconsistent growing conditions across agrowing area in turn may result in unpredictable and undesirablevariations in plant growth that similarly may be difficult to discern asthe plants are growing initially, but become evident at later stages ofgrowth when remediation measures may be difficult or impossible toimplement.

In general, varying space-dependent and/or time-dependent growingconditions over different portions of a growing area in conventionalcontrolled agricultural environments remain substantially undetected. Ifa curator of the environment observes variations in plant growth indifferent portions of a growing area, the curator may attempt tocompensate for such variations based on “experience,” e.g., adjustingone or more conditions in the environment using empirically-derivedmanual techniques (based on working with a given crop in a givenenvironment over several growing cycles) so as to improve growthconditions for sluggish or distressed crops. In some instances, one ormore sensors are employed in the environment to measure variousconditions relevant to plant growth; however, in those conventionalcontrolled agricultural environments in which one or more sensors may bedeployed, such sensors typically do not provide sufficient coverage forall of the plants in the growing area, nor are they deployed withsufficient spatial resolution to adequately observe significantvariations in growth conditions throughout a given growing area.Furthermore, different types of sensors (for measuring different typesof environmental conditions) are often deployed and/or operatedindependently of one another, making it challenging to comprehensivelymonitor multiple conditions in the environment relevant to plant growth.

In view of the foregoing challenges with conventional approaches tocontrolled agricultural environments, the present disclosure is directedto distributed sensing techniques in which multiple sensors are arrangedin the environment to provide sufficient coverage over a given growingarea. In one aspect, sensors are disposed in the growing area at anappropriate spatial resolution to effectively monitor growth conditionsof plants in the growing area, in some instances on a plant-by-plantbasis or for relatively small groups of plants. In another aspect,multiple sensors disposed in a growing area can be configured to utilizecommon power and network connections, thus simplifying the integrationof various sensors in the environment and data collection from thesensors.

In one exemplary implementation, multiple sensors are deployed in acontrolled agricultural environment as a distributed sensor grid. Thedistributed sensor grid includes one or more node arrays, where eachnode array divides at least a portion of the controlled agriculturalenvironment into nodes, e.g., discrete points in space which have aknown location (e.g., absolute or relative) in the environment. Invarious aspects, a given node array of a distributed sensor grid may beone dimensional, two dimensional, or three dimensional (e.g., based atleast in part on the distribution of growing areas and/or crops in thecontrolled agricultural environment). For example, in someimplementations, a given node array may include multiple nodes arrangedin a substantially linear or curvilinear fashion spaced along a row ofplants to provide a one-dimensional node array. Another type of nodearray may include multiple nodes arranged in horizontal planesubstantially parallel to a floor or a ceiling in the controlledagricultural environment to provide a two-dimensional node array. Yetanother type of node array may include multiple nodes arranged inmultiple horizontal planes substantially parallel to the floor orceiling in the controlled agricultural environment, wherein therespective horizontal planes of nodes constitute multiple verticallevels corresponding to different zones of interest in the controlledgrowing environment (e.g., the soil, the plant, the lighting canopy, andthe ambient environment).

An exemplary implementation of a distributed sensor grid 4000 for acontrolled agricultural environment is shown in FIG. 20A. Thedistributed sensor grid 4000 includes one or more node arrays 4100, andeach node array contains multiple nodes 4200 respectively positioned atcorresponding coordinate locations (e.g., X, Y, and Z coordinates) inthe controlled agricultural environment. At a given node 4200, thedistributed sensor grid further includes one or more sensors 4220deployed at the node to monitor growth conditions in proximity to thenode. In the example illustrated in FIG. 20A, the distributed sensorgrid is arranged as a three-dimensional node array, in which anarrangement of lighting fixtures 1000 constitutes a horizontal plane ofnodes defined by an X-axis and a Y-axis of the node array (see “TopView”), and the node array also includes multiple vertical levels 4300along a Z-axis (e.g., respectively corresponding to a soil level, aplant level, and a light canopy level; see “Side View”). One or moresensors 4220 may be placed at multiple nodes or each node of the nodearray to comprehensively monitor growth conditions in the environment.In one example, the sensors 4220 deployed at the nodes may be theintegrated sensor 3100 discussed above in connection with FIGS. 16A-19 .

Node Array

Each node array 4100 covers at least a portion of an agriculturalenvironment. In some controlled agricultural environments, one nodearray may be sufficient given a particular number and arrangement ofplants in a growing area, while in other environments multiple nodearrays may be employed to flexibly configure a distributed sensor grid(in some instances over multiple growing areas in the environment withdifferent layouts and/or different crops). For example, in verticalfarming (in which different growing areas are stacked one on top ofanother in a vertical arrangement), one or more node arrays 4100 can beused for each vertically-stacked growing area in the environment. Inanother example, an agricultural environment can be divided intoseparate climate-controlled rooms with each room having one or more nodearrays 4100. Each node array 4100 divides the covered portion of theagricultural environment into a grid of nodes 4200, where each node 4200is a discrete point with a known coordinate location within the nodearray 4100. As noted above, respective nodes 4200 can include one ormore sensors 4220 to monitor growth conditions proximate to a given node(e.g., in a volume of space around the node, which may depend in part onthe type(s) of sensor(s) deployed at the node). In some implementations,the number of nodes 4200 in a node array 4100 can depend upon theconstraints imposed on or by the agricultural environment.

The coordinate location of each node 4200 can include one or morecoordinate components to describe the location of a node 4200 in theagricultural environment. In some implementations, the coordinatelocation of a node 4200 can correspond to a physical location in theagricultural environment with reference to a spatial origin. Forexample, the corner of a growing area can be set as the origin of thecoordinate system and nodes 4200 can be defined at known and/or defineddistances from the origin along one or more axes (e.g., respective X, Y,and Z axes). In some implementations, the coordinate location cancorrespond to an indexed location related to one or more aspects of thephysical arrangement of the agricultural environment (e.g., dimensionsand/or shape of one or more growing areas, arrangement of plants in agiven growing area, arrangement of control systems in a given growingarea).

For example, FIGS. 20B-1-20B-4 illustrates an agricultural environmentthat includes two elongated shelves 902A and 902B disposed next to eachother at some spacing in a growing area. Three rows of plants arepositioned next to each other on each shelf along the long length of theshelf. Above each shelf, positioned generally over the middle row of thethree rows of plants, are four lighting fixtures 1000. In this example,a Y-axis for the node array is chosen parallel to the long length of theshelves 902A and 902B (and, accordingly, the X-axis is parallel to theshort width of the shelves). The center lines of the shelves themselvesalong the length (e.g., halfway across the width of a shelf) defineindexed positions 1 and 2 along the X-axis, and the four lightingfixtures 1000 disposed above each of the shelves 902A and 902Brespectively define indexed positions A, B, C, and D along the Y-axis(e.g., the centers of the lighting fixtures may correspond with theindexed positions A through D). The Z-axis for the node array is takenalong the vertical height of the environment, and is divided in theexample shown in FIGS. 20B-1-20B-4 into four indexed positions or“levels” 4300 (respectively labeled as L1, L2, L3 and L4). Thus, thereare a total of 32 nodes 4200 in the node array 4100 of the distributedsensor grid.

As discussed in greater detail below, it should be appreciated that theexample node array shown in FIGS. 20B-1-20B-4 based on two shelves ofplants, four lighting fixtures per shelf, and four vertical levels isprovided primarily for purposes of illustration, and that other nodearray configurations are contemplated according to the presentdisclosure.

For example, in some implementations in which the lighting fixtures 1000serve as a connectivity platform for a distributed sensor grid, thenumber of nodes 4200 supported in a node array 4100 is based at least inpart on the number of power and network ports available for connectionwith sensors 4220 deployed at respective nodes. For example, in theconfiguration shown in FIGS. 20B-1-20B-4 , each lighting fixture 1000includes USB ports 1012A and 1012B that may be employed to couple one ormore integrated sensor assemblies 3100 to each fixture (wherein theassemblies 3100 serve as the sensors 4220 deployed at respective nodes;also, lighting fixtures 1000 may be equipped with one or more additionalUSB ports for this purpose). Each lighting fixture also includes PoEports 1008A-D, any one or more of which ports may be employed to coupleone or more sensors to each fixture.

In some implementations, the number of nodes 4200 can be determined by auser-defined density and/or coverage area in the agriculturalenvironment. For example, the IR temperature sensor 3150 in theintegrated sensor assembly 3100 can have a finite field of view, asdescribed above. An array of integrated sensor assemblies 3100, eachcorresponding to a node 4200, can thus be installed and spaced apartsuch that the respective fields of view of the IR temperature sensors3150 sufficiently overlap to effectively provide sensing coverage forthe plants in the environment.

The distribution of nodes 4200 in the node array 4100 can also varyspatially and quantitatively. In some implementations, the nodes 4200can be uniformly distributed. For example, a uniform array of lightingfixtures 1000 can be deployed with an integrated sensor assembly 3100connected to USB ports 1012A and 1012B on each lighting fixture 1000, asdescribed above. In some implementations, the nodes 4200 distributed inthe node array 4100 can be non-uniform. For example, the number of nodes4200 may vary according to each level 4300 of a plant system where, forexample, more nodes 4200 can be used to monitor soil quality than theambient environment conditions due to variations in coverage by eachtype of sensor. In another example, an agricultural environment caninclude different plant species of varying size. The nodes 4200 can bemore closely spaced for smaller-sized plants and sparser forlarger-sized plants. Additionally, a node 4200 may not include a sensor4220. Such empty nodes 4200 can be used to define a non-uniformdistribution of sensors 4220 with a uniform distribution of nodes 4200.For example, soil quality sensors can occupy every node 4200 at thebottom level 4300 and ambient environment sensors can occupy every othernode 4200 at the top level 4300 with empty nodes 4200 in between.

As described above, the node array 4100 can include multiple levels 4300(e.g., along a Z-axis) that correspond to various zones of interest inthe controlled growing environment. An exemplary set of levels 4300 areshown in FIG. 20C. As shown, each level corresponds to a zone ofinterest in a plant system including a soil level 4310, a plant level4320, a light canopy level 4330, and an ambient environment level 4340.The soil level 4310 can provide data on soil conditions, such as pHvalue and chemical composition. The plant level 4320 can provide data onthe leaf temperature or CO2 concentrations near the plant. The lightcanopy level 4330 can provide data on the illumination source, e.g.,PPFD, air temperature, relative humidity, or heat dissipation orelectrical power for the lighting fixture 1000. The ambient environmentlevel 4340 can provide data on air circulation or the temperature of thewalls or ceiling of the agricultural environment.

FIGS. 20D-1-20D-4 show another exemplary implementation of a distributedsensor grid 4000 for a single elongated plant shelf 902A. Similar to theexample shown in FIGS. 20B-1-20B-4 , the X-axis is parallel to the shortwidth of the shelf 902A with an index position of 1 and the Y-axis isparallel to the long length of shelf 902A with index positions A, B, andC. The node array is divided into three nodes 4200 along the Z-axiscorresponding to three levels 4300 with indices L1, L2, and L3. As shownin FIGS. 20D-1-20D-4 , the location of the nodes 4200 can be defined, atleast in part, by the respective locations of lighting fixtures 1000 inthe agricultural environment. FIGS. 20E-1-20E-5 show yet anotherexemplary implementation of a distributed sensor grid 4000 for numerousplant shelves in an agricultural environment. The X-axis is indexedaccording to plant shelves with index positions 0 through 15. The Y-axisis indexed according to each lighting fixture 1000 with index positionsA through J. An index AA is included corresponding to the edge of theplant shelves. The Z-axis is defined along the vertical height of theenvironment with index positions L1, L2, and L3. As shown, the X-axisindex positions can be defined such that the nodes 4200 cover one ormore plant shelves. Nodes 4200 can also be defined to cover regionswhere no plants are presented, e.g., X-axis indices 7 and 8, which canprovide uniform coverage across the environment, e.g., a uniform grid ofnodes 4200 can measure air flow, which can be affected by obstacleslocated between growing areas.

Sensors

One or more sensors 4220 can be deployed at a particular node 4200 tomonitor parameters relevant to growth conditions. The sensors 4220 caninclude, but are not limited to, a visible light sensor, a UV lightsensor, an air temperature sensor, a relative humidity sensor, anairflow sensor, a CO2 sensor, an IR temperature sensor, a chemicalsensor, a pH sensor, and cameras configured to capture still images orvideos of the agricultural environment with various spectral qualities,as described above. In some implementations, multiple sensors 4220 canbe packaged into an integrated sensor assembly 3100, as described aboveto simplify wiring and ease of installation. Each node 4200 in a nodearray 4100 can also include different combinations of sensors 4220pertinent to the region of the environment the node 4200 is located in.For example, different types of sensors 4220 may be deployed accordingto the levels 4300 used in an environment.

The nodes 4200 in the node array 4100 can also be configured to sharepower and network connections to simplify the integration of multiplesensors 4220 in the distributed sensor grid 4000. As described above, insome implementations a plurality of lighting fixtures 1000 can be usedas a connectivity platform for the distributed sensor grid 4000. Sensors4220 can couple to the PoE ports 1008A-D or the USB ports 1012A and1012B for power and networking using cables or dongles, exemplaryexamples of which are shown in FIGS. 18 and 19 . In someimplementations, multiple sensors 4220 located at various levels 4300can be connected to a single lighting fixture 1000. For example, a soilsensor can be connected via a long USB extension cable dangled from aUSB port 1012B (e.g., an exemplary image is shown in FIG. 33S) and alighting sensor can be connected directly to a PoE port. By connectingthe plurality of lighting fixtures 1000 together, the sensors 4220 canalso be connected thus forming a distributed array of sensors.

Control Systems

Distributed sensors in the agricultural environment can also be coupledto one or more control systems such that data acquired by one or more ofthe distributed sensors may be used to adjust the operating parametersof one or more control systems. The control systems can include, but arenot limited to, lighting, heating, air flow, hydronics, and humidityconditioning systems. For many agricultural environments, the controlsystems may be configured to affect growing conditions from a single orfew locations in the environment. For example, HVAC systems affectingair flow may be dispersed intermittently along the wall or ceiling in anenvironment, thus affecting multiple nodes 4200 when operatingparameters are changed. In another example, a lighting fixture 1000 canaffect growing conditions at nodes 4200 located directly below and nearthe lighting fixture 1000. Thus, data acquired by one or more sensors4220 can be used to adjust the control systems such that growingconditions across multiple nodes 4200 are improved or maintained.

Human Machine Interface

In some implementations, the distributed sensor grid 4000 can beconnected to a processor 5000, as shown in FIG. 20A. The processor 5000can be a computer or a server, which processes and stores various datafrom the sensors 4220 in the distributed sensor grid 4000. The processor5000 may also include a HMI 5100, an exemplary implementation of whichis shown on a computer in FIG. 21A, that allows users to monitor andcontrol various aspects of the agricultural environment. For example,users may access various data obtained by the sensors 4220, view anddisplay various data, and control one or more control systems, e.g.,lighting, heating, air flow, hydronics, and humidity conditioningsystems.

In some implementations, the HMI 5100 may enable users to select one ormore nodes 4200 from an array 4100 in the distributed sensor grid 4000and display the data collected by these nodes 4200. To facilitateselection of nodes 4200, the HMI 5100 may include a representation ofthe agricultural environment. For example, FIGS. 21B-21G show varioustop and side views of different arrangements of plants (e.g.,horizontal/vertical farming, one or multiple plant shelves, one ormultiple rows of plants per shelf). As shown, the representation of theagricultural environment may be overlaid with data recorded by varioussensors disposed in the distributed sensor grid 4000. For instance,FIGS. 21C and 21E show sensory data for each lighting fixture 1000. FIG.21G shows sensory data at different levels (e.g., the soil level 4310,the plant level 4320, the light canopy level 4330, and the ambientenvironment level 4340). The data shown may include, but is not limitedto, the operating parameters of various control systems (e.g., powerdraw from lighting fixtures 1000, pump power in a hydronics system) andenvironmental parameters (e.g., air temperature, leaf temperature, airflow rate, relative humidity, PPFD, pH level). The HMI 5100 may alsoallow users to select different node arrays 4100 (e.g., separate growingareas or rooms in an environment), views of the environment (e.g., topview, side view, perspective view), and control systems coupled to thesensors 4220 (e.g., various lighting fixtures 1000). Data can also beupdated in real-time, selected from list of recorded times, or displayedas an average over a period of time.

The HMI 5100 may allow users to display historical data as a function oftime as shown in FIGS. 21H-J. For instance, FIG. 21H shows theenvironment temperature, relative humidity, electrical power,temperature of a lighting fixture 1000, carbon dioxide concentration,entering water temperature (EWT), leaving water temperature (LWT), andsystem on a chip (SoC) temperature over a period of several days. Datacan be recorded continuously in real-time or incrementally over set timeincrements (e.g., every 30 minutes, 60 minutes, and 3 hours). The HMI5100 may also allow users to control and display a schedule as shown inFIGS. 21I and 21J as a Gantt chart. A schedule can be used to organizetasks to be performed on the environment (e.g., a maintenance schedulefor various systems in the environment during a week of operation,periods of the day when hydronics or HVAC systems should turn on).Three-dimensional line plots can also be used to display data as afunction of multiple parameters as shown in FIG. 21J.

The HMI 5100 may also allow users to adjust control systems (e.g.,adjusting the output of a lighting fixture 1000 to simulate a sunriseand sunset). In some implementations, the processor 5000 may automate,at least in part, various controllable conditions based on data from oneor more sensors 4420 and user-defined criteria (e.g., set temperature,relative humidity, CO2 concentrations).

As described above, one or more cameras may be coupled to thedistributed sensor grid 4000 to record still images or video of aportion of the agricultural environment as shown in FIG. 21K to allowusers to remotely inspect the environment. In some implementations, theselection of a camera can be based on the proximity and field of view ofa camera in relation to the nodes 4200 or a control system, e.g., alighting fixture 1000, selected by a user. Images or video can beacquired on command by a user or recorded on a preset schedule.

The HMI 5100 can also be configured to display multiple views, data, andimages or video of the environment separated in various panels. Forexample, FIG. 21A shows an exemplary implementation of the HMI 5100 in aquadrant format, which includes different views of a representation ofthe environment, a time history of various data, and images recorded bya camera are shown (see FIGS. 21A-1, 21D, 21E, 21H).

In some implementations, the processor 5000 can also perform additionalanalysis on data collected by the sensors 4420 in the distributed sensorgrid 4000. An exemplary illustration of such analysis is shown in FIGS.22A-C, which shows various views of a three-dimensional air flowdistribution in an environment captured at various times.

Root Zone Level Monitoring

Based on the various concepts described above and illustrated in theaccompanying drawings, various inventive implementations involving asensing system configured to monitor a root zone level of a plant systemcompatible with the distributed sensing techniques will now bedescribed.

With reference again to FIG. 20C, and in particular the soil level 4310of the node array 4100, in some types of controlled agriculturalenvironments the plants or crops are grown in soil, while in otherenvironments the plants or crops are not grown in soil; instead, theroot systems of respective plants may be exposed to a variety of othernutrient sources and/or various techniques to provide nutrients to theroot systems. In view of the foregoing, in other implementations of theinventive concepts discussed herein, the soil level discussed above inconnection with a node array may be viewed more generally as a “rootzone level” (whether the roots be in soil or exposed to one or moreother nutrient sources). As noted above, one or more sensors may besituated in the root zone level to measure and monitor variousconditions and parameters germane to the health and nutrition of one ormore root systems.

In general, the root system of a plant can provide various functionsimportant to the growth and health of the plant. For example, the rootsystem can absorb water and nutrients from the surrounding environment,providing nourishment to the plant. The root system can also storenutrients for future consumption. The degree to which the root systemcan provide such functions can be affected by the environmentalconditions surrounding the root system. For instance, subparenvironmental conditions can reduce the uptake of water or nutrients bythe plant. By deploying sensors to monitor environmental conditionsspecific to the root system of the plant, e.g., in the root zone levelof a node array, data from the sensors can be used to adjust variouscontrol systems in the agricultural environment to improve or maintainthe functionality of the root system.

As an alternative to soil (e.g., dirt), “hydroponics” refers to methodsof growing plans without soil, and instead using nutrient solutions(e.g., minerals in a water solvent. Plants may be grown with only theirroots exposed to the mineral solution, or the roots may be supported byan inert medium (e.g., gravel or perlite). Examples of hydroponicsmethods that do not use a solid medium include Nutrient Film Techniques(NFT), Deep Water Culture (DWC), wick hydroponics, ebb and flow systems,drip hydroponics, and aeroponic methods (techniques in which plants aregrown in an air or mist environment, e.g., fogponics, mistponics, inwhich a plant's dangling roots and lower stem are spayed with anatomized nutrient-rich solution). A variety of nutrients can be used inhydroponics methods (sometimes also referred to as “fertigation”);examples of such nutrients include, but are not limited to, natural orsynthetic fertilizers, byproduct from fish waste, and duck manure.

The environmental conditions that can affect the functionality of theroot system can vary depending on the type of the agriculturalenvironment used. For example, in the soil-based environments discussedearlier, the functionality of the root system can depend on variousparameters including, but not limited to, (1) the soil temperature, (2)the electrical conductivity of soil, which is an indicator of soilsalinity, soil texture, and moisture content (3) the pH value, (4) thewater tension, which relates to the force root systems should overcometo extract water from the soil, (5) the air permeability, (6) the soilcompaction, which can be an indicator of water and soil quality, and (7)the water content of the soil. For hydroponic environments, thefunctionality of the root system can depend on various parametersincluding, but not limited to, (1) solution temperature, (2) the pHvalue, (3) the electrical conductivity, which is an indicator ofsolution salinity, and (4) the oxidation-reduction potential, whichprovides water oxygenation and bio activity.

Various types of sensors can be employed in the root zone level of anode array according to the concepts disclosed herein to monitor thevarious parameters described above. Examples of sensors that may beemployed in the root zone level include, but not limited to, temperaturesensors (e.g., thermocouple, thermistor, resistance temperaturedetectors), electromagnetic sensors for electrical conductivity,dissolved oxygen sensors, nitrogen sensors, carbon dioxide sensors,optical sensors (e.g., photodetectors configured for visible,near-infrared (NIR), mid-infrared (MIR), and polarized light),mechanical sensors for soil compaction, electrochemical sensors (e.g.,pH sensors), airflow sensors for soil air permeability, and watercontent sensors (e.g., coaxial impedance dielectric reflectometry,frequency domain reflectometry, time domain transmissometry, gypsumblocks, neutron probes).

CONCLUSION

All parameters, dimensions, materials, and configurations describedherein are meant to be exemplary and the actual parameters, dimensions,materials, and/or configurations will depend upon the specificapplication or applications for which the inventive teachings is/areused. It is to be understood that the foregoing embodiments arepresented primarily by way of example and that, within the scope of theappended claims and equivalents thereto, inventive embodiments may bepracticed otherwise than as specifically described and claimed.Inventive embodiments of the present disclosure are directed to eachindividual feature, system, article, material, kit, and/or methoddescribed herein.

In addition, any combination of two or more such features, systems,articles, materials, kits, and/or methods, if such features, systems,articles, materials, kits, and/or methods are not mutually inconsistent,is included within the inventive scope of the present disclosure. Othersubstitutions, modifications, changes, and omissions may be made in thedesign, operating conditions and arrangement of respective elements ofthe exemplary implementations without departing from the scope of thepresent disclosure. The use of a numerical range does not precludeequivalents that fall outside the range that fulfill the same function,in the same way, to produce the same result.

The above-described embodiments can be implemented in multiple ways. Forexample, embodiments may be implemented using hardware, software or acombination thereof. When implemented in software, the software code canbe executed on a suitable processor or collection of processors, whetherprovided in a single computer or distributed among multiple computers.

Further, it should be appreciated that a computer may be embodied in anyof a number of forms, such as a rack-mounted computer, a desktopcomputer, a laptop computer, or a tablet computer. Additionally, acomputer may be embedded in a device not generally regarded as acomputer but with suitable processing capabilities, including a PersonalDigital Assistant (PDA), a smart phone or any other suitable portable orfixed electronic device.

Also, a computer may have one or more input and output devices. Thesedevices can be used, among other things, to present a user interface.Examples of output devices that can be used to provide a user interfaceinclude printers or display screens for visual presentation of outputand speakers or other sound generating devices for audible presentationof output. Examples of input devices that can be used for a userinterface include keyboards, and pointing devices, such as mice, touchpads, and digitizing tablets. As another example, a computer may receiveinput information through speech recognition or in other audible format.

Such computers may be interconnected by one or more networks in asuitable form, including a local area network or a wide area network,such as an enterprise network, an intelligent network (IN) or theInternet. Such networks may be based on a suitable technology, mayoperate according to a suitable protocol, and may include wirelessnetworks, wired networks or fiber optic networks.

The various methods or processes outlined herein may be coded assoftware that is executable on one or more processors that employ anyone of a variety of operating systems or platforms. Additionally, suchsoftware may be written using any of a number of suitable programminglanguages and/or programming or scripting tools, and also may becompiled as executable machine language code or intermediate code thatis executed on a framework or virtual machine. Some implementations mayspecifically employ one or more of a particular operating system orplatform and a particular programming language and/or scripting tool tofacilitate execution.

Also, various inventive concepts may be embodied as one or more methods,of which at least one example has been provided. The acts performed aspart of the method may in some instances be ordered in different ways.Accordingly, in some inventive implementations, respective acts of agiven method may be performed in an order different than specificallyillustrated, which may include performing some acts simultaneously (evenif such acts are shown as sequential acts in illustrative embodiments).

All publications, patent applications, patents, and other referencesmentioned herein are incorporated by reference in their entirety.

All definitions, as defined and used herein, should be understood tocontrol over dictionary definitions, definitions in documentsincorporated by reference, and/or ordinary meanings of the definedterms.

The indefinite articles “a” and “an,” as used herein in thespecification and in the claims, unless clearly indicated to thecontrary, should be understood to mean “at least one.”

The phrase “and/or,” as used herein in the specification and in theclaims, should be understood to mean “either or both” of the elements soconjoined, i.e., elements that are conjunctively present in some casesand disjunctively present in other cases. Multiple elements listed with“and/or” should be construed in the same fashion, i.e., “one or more” ofthe elements so conjoined. Other elements may optionally be presentother than the elements specifically identified by the “and/or” clause,whether related or unrelated to those elements specifically identified.Thus, as a non-limiting example, a reference to “A and/or B”, when usedin conjunction with open-ended language such as “comprising” can refer,in one embodiment, to A only (optionally including elements other thanB); in another embodiment, to B only (optionally including elementsother than A); in yet another embodiment, to both A and B (optionallyincluding other elements); etc.

As used herein in the specification and in the claims, “or” should beunderstood to have the same meaning as “and/or” as defined above. Forexample, when separating items in a list, “or” or “and/or” shall beinterpreted as being inclusive, i.e., the inclusion of at least one, butalso including more than one, of a number or list of elements, and,optionally, additional unlisted items. Only terms clearly indicated tothe contrary, such as “only one of” or “exactly one of,” or, when usedin the claims, “consisting of,” will refer to the inclusion of exactlyone element of a number or list of elements. In general, the term “or”as used herein shall only be interpreted as indicating exclusivealternatives (i.e. “one or the other but not both”) when preceded byterms of exclusivity, such as “either,” “one of,” “only one of,” or“exactly one of” “Consisting essentially of” when used in the claims,shall have its ordinary meaning as used in the field of patent law.

As used herein in the specification and in the claims, the phrase “atleast one,” in reference to a list of one or more elements, should beunderstood to mean at least one element selected from any one or more ofthe elements in the list of elements, but not necessarily including atleast one of each and every element specifically listed within the listof elements and not excluding any combinations of elements in the listof elements. This definition also allows that elements may optionally bepresent other than the elements specifically identified within the listof elements to which the phrase “at least one” refers, whether relatedor unrelated to those elements specifically identified. Thus, as anon-limiting example, “at least one of A and B” (or, equivalently, “atleast one of A or B,” or, equivalently “at least one of A and/or B”) canrefer, in one embodiment, to at least one, optionally including morethan one, A, with no B present (and optionally including elements otherthan B); in another embodiment, to at least one, optionally includingmore than one, B, with no A present (and optionally including elementsother than A); in yet another embodiment, to at least one, optionallyincluding more than one, A, and at least one, optionally including morethan one, B (and optionally including other elements); etc.

In the claims, as well as in the specification above, all transitionalphrases such as “comprising,” “including,” “carrying,” “having,”“containing,” “involving,” “holding,” “composed of,” and the like are tobe understood to be open-ended, i.e., to mean including but not limitedto. Only the transitional phrases “consisting of” and “consistingessentially of” shall be closed or semi-closed transitional phrases,respectively, as set forth in the United States Patent Office Manual ofPatent Examining Procedures, Section 2111.03.

1. (canceled)
 2. A system for a controlled agricultural environmenthaving a plurality of plants with respective root systems that define aroot zone, the system comprising: a first lighting fixture and sensorplatform disposed above the plurality of plants, the first lightingfixture and sensor platform comprising: a housing; at least one lightsource mechanically supported by the housing; control circuitry toreceive AC power, to convert the AC power to DC power, and to controlthe at least one light source based at least in part on the DC power;and at least one port coupled to the control circuitry; and one or moresensors, disposed in the root zone of the plurality of plants andelectrically coupled to the at least one port of the first lightingfixture and sensor platform via a wired connection, to measure andmonitor sensor data associated with at least one condition germane tohealth and nutrition of at least a first root system of the respectiveroot systems of the plurality of plants, wherein: the at least one portand the wired connection provides DC power to the one or more sensorsand communication between the one or more sensors and the controlcircuitry; and the control circuitry processes at least a first portionof the sensor data to analyze at least one of soil moisture or nutrientcontent.
 3. The system of claim 1, wherein the one or more sensorscomprises at least one of: a temperature sensor; a sensor for electricalconductivity; a dissolved oxygen sensor; a nitrogen sensor; a carbondioxide sensor; an optical sensor; a mechanical sensor for soilcompaction; an electrochemical sensor; an airflow sensor for soil airpermeability; or a water content sensor.
 4. The system of claim 1,wherein: the one or more sensors comprises a first sensor and a secondsensor; and the at least one port comprises a first port, coupled to thefirst and second sensors, to provide DC power and communication to thefirst and second sensors.
 5. The system of claim 1, further comprising:a second lighting fixture and sensor platform disposed above theplurality of plants; and a network communications cable, communicativelycoupled to the first lighting fixture and sensor platform and the secondlighting fixture and sensor platform, to transfer at least one of dataor control signals from the second lighting fixture and sensor platformto the first lighting fixture and sensor platform, wherein the controlcircuitry of the first lighting fixture and sensor platform processesthe at least one of data or control signals and/or transmits the atleast one of data or control signals to another lighting fixture or aremote computer.
 6. The system of claim 1, wherein: the first lightingfixture and sensor platform further comprises: a fluid coolant pipe,coupled to the housing, to carry a fluid coolant to extract heatgenerated by the at least one LED light source during operation of thefirst lighting fixture and sensor platform; the system furthercomprises: a coolant circuit including the fluid coolant pipe of thefirst lighting fixture and sensor platform to carry the fluid coolant;and a hydronics system, coupled to the coolant circuit andcommunicatively coupled to the first lighting fixture and sensorplatform, to recycle the heat extracted from the first lighting fixtureand sensor platform and captured by the fluid coolant, the hydronicssystem comprising: a hydronics loop, fluidically coupled to the coolantcircuit and disposed proximate to the root zone of the plurality ofplants, to regulate a temperature of at least a portion of the root zonebased on the sensor data.
 7. The system of claim 1, further comprising:a remote computer, communicatively coupled to the control circuitry ofthe first lighting fixture and sensor platform, having a human-machineinterface (HMI) to facilitate monitoring and control of the controlledagricultural environment, wherein: the control circuitry of the firstlighting fixture and sensor platform transmits at least one of the firstportion or a second portion of the sensor data to the remote computer;and the HMI is configured to display: a representation of the controlledagricultural environment including at least a portion of the root zoneof the plurality of plants; and at least one of the first portion or thesecond portion of the sensor data overlaid on the portion of the rootzone.